Showing papers on "Weldability published in 1983"
Book•
01 Oct 1983
TL;DR: The properties of Austenitic Stainless Steel at Cryogenic Temperatures- Development of Cryogenic Structural Materials for Tokamak Reactor- Martensitic Transformations in Fe-Cr-Ni Stainless Steels- The Influence of Martensite Transformation on Strength and Plasticity of Fe-cr-Ni Alloy Single Crystals-Austenitic-Steel Elastic Constants- Temperature Dependence of Flow Strength of Selected AustenIT Steels for Superconducting Magnet- Factors Influencing the low-temperature dependentence of Yielding in AISI 316 Stainless STEels- Tough
Abstract: The Properties of Austenitic Stainless Steel at Cryogenic Temperatures- Development of Cryogenic Structural Materials for Tokamak Reactor- Martensitic Transformations in Fe-Cr-Ni Stainless Steels- The Influence of Martensitic Transformation on Strength and Plasticity of Fe-Cr-Ni Alloy Single Crystals- Austenitic-Steel Elastic Constants- Temperature Dependence of Flow Strength of Selected Austenitic Stainless Steels- Cryogenic Properties of Austenitic Stainless Steels for Superconducting Magnet- Factors Influencing the Low-Temperature Dependence of Yielding in AISI 316 Stainless Steels- Toughness and Fatigue Properties of Austenitic Steels at Cryogenic Temperature and Their Application in Complex Structures- Automated Near-Threshold Fatigue Crack Growth Rate Testing of JBK-75 Stainless Steel at Cryogenic Temperatures- Effects of Magnetic Field on Tensile Behavior at 4 K of Alloys 304 and 310- Effects of Magnetic Fields on Martensite Transformations and Mechanical Properties of Steels at Low Temperatures- Effect of EB-Weld and Cold-Rolling on Low Temperature Strength and Toughness of Austenitic Stainless Steels- The Effect of c-Ferrite upon the Low Temperature Mechanical Properties of Centrifugally Cast Stainless Steels- The Mechanical Properties of Stainless Steel Castings at 4 K- Heat Treatments to Desensitize and Remove Delta Ferrite from a 21Cr-6Ni-9Mn Stainless Steel Intended for the Fabrication of Aerofoil Models for Cryogenic Wind Tunnels- Preliminary Study on Structural Material Selection for Large Superconducting Magnets- Low Temperature Mechanical and Physical Properties of Age-Hardened Fe-Ni-Cr-Mn Alloys- Automated Near-Threshold Fatigue Crack Growth Rate Testing of JBK-75 Stainless Steel at Cryogenic Temperatures- Low Temperature Properties of High-Manganese-Molybdenum Austenitic Iron Alloys- Structure and Mechanical Properties of High-Alloy Manganese-Aluminum Steels for Cryogenic Applications- Fracture Properties of a 25Mn Austenitic Steel and Its Welds at 4 K- The Weldability of 25 Mn Steel- Instrumented Charpy Impact Tests at Low Temperatures for Several Steels- Temperatures for Several Steels- GRI's Research Program on Crack Initiation and Arrest Properties of 9% Nickel Steels Used in LNG Storage Vessels- Indexes- List of Contributors- Alloy Index
81 citations
Journal Article•
37 citations
Patent•
26 Sep 1983
TL;DR: In this article, a low-alloy steel shape of at least 3/16 inch thickness is produced by providing a steel consisting essentially of from about 0.02% to 0.07% carbon, 1.2% to 2.0% manganese, 0.4% molybdenum, columbium, and balance iron.
Abstract: Low alloy steel shape of at least 3/16 inch thickness is produced by providing a steel consisting essentially of from about 0.02% to 0.07% carbon, 1.2% to 2.0% manganese, 0.020% maximum sulfur, up to 0.5% silicon, 0.1% to 0.4% molybdenum, 0.01% to 0.1% columbium, about 0.01% to 0.10% acid soluble aluminum, about 0.8% to 2.0% copper, about 0.4% to 2.0% nickel, residual chromium, and balance iron; hot reducing the steel to a desired final thickness with a total reduction in thickness of at least 30% while within the temperature range of about 1400° to 1700° F. whereby to avoid substantial recrystallization of austenite and to obtain a predominant heavily deformed austenite phase; and cooling at a rate which transforms the austenite phase to a predominantly fine acicular ferrite and lower-bainite phase. The steel may also be precipitation hardened, or may be hot reduced either by the above-described controlled hot reduction or by conventional hot reduction, austenitized, quenched, and precipitation hardened. The product has high strength, improved low temperature toughness and excellent weldability.
23 citations
TL;DR: In this article, three new types of corrosion-resistant steel sheets for automotive body panels have been developed, which have excellent corrosion resistance and paintability for relatively low coating weight, their formability, weldability and other properties are also balanced well.
Abstract: Three new types of corrosion-resistant steel sheets for automotive body panels have been developed.1) Zinc-nickel alloy electroplated steel sheet2) Two-layer zinc-iron alloy electroplated steel sheet3) Organic composite-coated steel sheetWith their protective coating alloyed, applied in two layers or composited, these corrosion-resistant steel sheets have excellent corrosion resistance and paintability for relatively low coating weight. Their formability, weldability and other properties are also balanced well. This report mainly describes the development concept and quality performance of each of the new types of corrosion-resistant sheets.
21 citations
Journal Article•
20 citations
TL;DR: In this article, the physical metallurgy of these steels is reviewed and discussed, with emphasis on processing, structure-property relationship, and response to the U-O-E pipe forming process.
Abstract: The discovery of oil and natural gas in severe climate conditions such as arctic regions has resulted in more-demanding mechanical property requirements for high-strength linepipe steels. These steels should have higher strength and toughness as well as excellent weldability. New high-strength, low-alloy (HSLA) steels for linepipe have been developed from the laboratory to full-scale production with astonishing speed in the last decade. These steels can be divided into three categories based on the microstructure, namely, ferrite-pearlite steels, acicular ferrite or bainitic steels, and multiphase steels. The physical metallurgy of these steels is reviewed and discussed, with emphasis on processing, structure-property relationship, and response to the U-O-E pipe forming process.
20 citations
Patent•
17 Sep 1983
TL;DR: In this paper, an inert film is formed on the surface of the continuous zinc layer of a galvanized steel sheet by about 1-500mg/m, and the sheet is dried after carrying out washing as required to form said inert film.
Abstract: PURPOSE:To obtain a galvanized steel sheet with superior weldability by forming an inert film on the surface of the zinc layer of a galvanized steel sheet. CONSTITUTION:An inert film is formed on the surface of the continuous zinc layer of a galvanized steel sheet. An aqueous soln., a colloidal soln. or a slurry dispersion soln. contg. carbonates, phosphates, borates, nitrates, sulfate, chlorides, hydroxides or oxides of one or more among Ti, Al, Ni, Fe, Si, Mn, Co, W, Mo, Ca, B, Be and Zn is applied to the surface of the galvanized steel sheet by about 1-500mg/m , and the sheet is dried after carrying out washing as required to form said inert film. Thus, the weldability of the galvanized steel sheet is improved, and welding stability is ensured.
14 citations
Patent•
01 Aug 1983
TL;DR: In this article, an aqueous solution containing a divalent Ni-ion such as Ni-acetate is applied to the treated steel plate so as to secure 30-300mg/m per a single surface of a metal Ni-addhesion dried.
Abstract: PURPOSE:To inexpensively prepare steel plate for a can and a container excellent in weldability, by reducing a steel plate coated with a divalent Ni-ion under heating to diffuse and penetrate formed metal Ni throughout steel, and further applying Sn-electroplating and chromate treatment to the steel plate. CONSTITUTION:After the surface of a cold rolled steel plate is subjected to activation treatment, an aqueous solution containing a divalent Ni-ion such as Ni-acetate is applied to the treated steel plate so as to secure 30-300mg/m per a single surface of a metal Ni-addhesion dried. Subsequently, this coated steel plate is heated to about 500- 750 deg.C in a reductive atmosphere to reduce the Ni-compound on the surface of the steel plate to metal Ni through the decomposition of said Ni-compound while a part or the whole of Ni is diffused and penetrated into the surface of the steel plate. Thereafter, refining rolling or cold rolling is applied to the steel plate and Sn-electroplating is subsequently applied to the rolled steel plate so as to adjust an addhesion amount per a single surface to 100-1,500mg/m while, if necessary, the Sn-plating layer is subjected to tin dissolving treatment and, further, chromate treatment to form a chromate film pref. in an amount of about 3-20mg/m per a single surface on the basis of a Cr- amount. By this method, a steel plate for a can and a container excellent in weldability is obtained.
14 citations
TL;DR: The properties and advantages of Galfan (a Zn-5%Al-0.05% misch metal alloy) as a corrosion-resistant coating for steel sheet and wire are described in this article.
Abstract: The properties and advantages of Galfan (a Zn-5%Al-0.05% misch metal alloy) as a corrosion-resistant coating for steel sheet and wire are described. Galfan is superior, with regard to corrosion resistance and formability, to standard galvanized steel sheet and wire of equal coating thickness and has comparable properties with regard to paintability and weldability.
13 citations
11 citations
01 Jan 1983
TL;DR: The AISI 300 series stainless steels, especially alloys 304, 310, and 316, are used extensively for cryogenic structures as discussed by the authors, but their use is complicated by the metastability of the austenitic structure of most alloys of this Fe-Cr-Ni alloy series.
Abstract: The AISI 300 series stainless steels, especially alloys 304, 310, and 316, are used extensively for cryogenic structures. These alloys have a high elastic modulus, high toughness and ductility, low thermal and electrical conductivity, and good weldability. Because of these characteristics, they are used more than any other alloy class for structures for service at 20 K and below, but their use is complicated by the metastability of the austenitic structure of most alloys of this Fe-Cr-Ni alloy series. The metastability leads tomartensitic transformation during cooling, from applied stress or during plastic deformation. The martensitic transformation is a significant design consideration in applications requiring fracture control planning, close dimensional tolerances, the absence of a ferromagnetic phase, and high toughness of weldment, heat-affected zone, and base metal. Consequently, research has been conducted to characterize the transformations and their effects on mechanical and physical properties and in-service performance.
TL;DR: Galfan as discussed by the authors is a corrosion resistant coating system for steel sheet and wire that consists of eutectic zinc-5% aluminum plus a small addition of mischmetal (less than 1%).
Abstract: A new corrosion-resistant coating system, known as Galfan, has been developed for steel sheet and wire This alloy consists of eutectic zinc-5% aluminum plus a small addition of mischmetal (less than 01%) It has demonstrated corrosion resistance more than twice that of conventional galvanized steel sheet or wire under similar conditions and similar coating thicknesses The coating also has extremely good ductility under cold forming conditions and behaves comparably to conventional galvanized steel sheet with respect to spot weldability and paintability The bath operating temperature is slightly lower than required for conventional continuous galvanizing baths, providing maximum economy in energy utilization and compatibility in coating high carbon steel spring wire Conventional continuous galvanizing lines of the Sendzimir, Selas or Heurtey type can be converted to Galfan coating with a nominal capital investment, provided a cast iron or ceramic crucible is available Recent research shows that Galfan may be adaptable to a Cook-Norteman continuous galvanizing line and to batch galvanizing The development of this product fills a commercial need for a superior product with minimal changes in established conventional galvanizing processing methods
Patent•
14 Nov 1983
Patent•
01 Jun 1983
TL;DR: In this article, the authors proposed a stainless steel with superior corrosion resistance even in the presence of Cr 6+ and superior weldability by restricting the C and P contents of a 25%Cr-20%Ni-Fe alloy, restricting the amounts of Cr and Ni, and adding a specified amount of N.
Abstract: PURPOSE: To obtain a stainless steel showing superior corrosion resistance even in the presence of Cr 6+ as well as superior weldability by restricting the C and P contents of a 25%Cr-20%Ni-Fe alloy, restricting the amounts of Cr and Ni, and adding a specified amount of N. CONSTITUTION: This austenitic stainless steel consists of, by weight, ≤0.005% C, ≤0.4% Si, 0.1W12% Mn, 15W30% Cr, 7W28% Ni, ≤0.005% P, 0.06W0.30% N and the balance Fe. the steel shows superior corrosion resistance especially as a structural material for an apparatus for reprocessing nuclear fuel. COPYRIGHT: (C)1984,JPO&Japio
Patent•
03 Aug 1983
TL;DR: In this article, a continuous casting billet contg. 0.005-0.090% C, =60% and the finishing temp. limited to =500 deg.C and the Ac 1 point or below after said steel is allowed to cool or is forcibly cooled, by which the intended excellent weldability and low-temp. toughness is obtd.
Abstract: PURPOSE:To obtain a Cu-added steel having excellent strength, toughness and welding characteristic by heating a continuous casting billet contg. C, Si, Mn, Nb, Cu, Al and S respectively at prescribed ratios at a low temp. and rolling said steel under specific conditions then cooling the rolled steel and subjecting the same to a tempering treatment. CONSTITUTION:A continuous casting billet contg. 0.005-0.090% C, =60% and the finishing temp. limited to =500 deg.C and the Ac1 point or below after said steel is allowed to cool or is forcibly cooled, by which the Cu-added steel having the intended excellent weldability and low-temp. toughness is obtd.
Patent•
08 Jul 1983
TL;DR: In this article, an iron-tin-Ni alloy is formed on a steel sheet and plated on the 1st layer in a 0.1W1g/m 2, more preferably 0.3W 0.6g/ m 2 and is melted to form the 2nd layer contg. an irontin-ni alloy.
Abstract: PURPOSE: To produce a raw material for welding having excellent weldability and corrosion resistance for food canning by forming an iron-Ni alloy layer under specific conditions on a steel sheet, depositing a specific amt. of tin on said layer and subjecting the layer to an electrolytic chromate treatment. CONSTITUTION: The 1st layer consisting of an iron-Ni alloy having the compsn. ranging 0.02W0.50, more preferably 0.05W0.20 [Ni/(Fe+Ni)] by weight and having 10W5,000Å, more preferably 100W1,500Å thickness is formed on a steel sheet. Tin is then plated on the 1st layer in a 0.1W1g/m 2 , more preferably 0.3W 0.6g/m 2 and is melted to form the 2nd layer contg. an iron-tin-Ni alloy. The 3rd layer consisting of metallic Cr and Cr hydroxide in a 5W20mg/m 2 , more preferably 7W15mg/m 2 range in terms of chromium is further formed on the 2nd layer by which the titled surface treated steel sheet for food canning is produced. COPYRIGHT: (C)1985,JPO&Japio
01 Jan 1983
TL;DR: The weldability of a 12% chromium duplex ferritic-martensitic steel, as well as the effects on mechanical properties of changes in composition and annealing treatment are briefly reviewed in this paper.
Abstract: The weldability of a 12% chromium duplex ferritic-martensitic steel, as well as the effects on mechanical properties of changes in composition and annealing treatment are briefly reviewed.
Patent•
26 Oct 1983
TL;DR: In this paper, the authors used 15Cr-6Ni-2Mo martensitic cast steel as Cr-Ni-Mo cast steel for a propeller for a large-scale seawater pump for the power generation.
Abstract: PURPOSE: To obtain the titled cast steel with high toughness and superior corrosion fatigue strength by using 15Cr-6Ni-2Mo martensitic cast steel as Cr-Ni-Mo cast steel. CONSTITUTION: This martensitic cast steel consists of, by weight, 0.02W0.07% C, 0.2W0.6% Si, 0.3W0.8% Mn, 4.5W7% Ni, 14.5W16.5% Cr, 1.5W3% Mo and the balance Fe and contains ferrite and austenite. The cast steel has higher toughness than 14Cr-5Ni-1Mo-0.25Nb cast steel for a propeller, and it is superior to 13Cr-15Ni-1.5Mo cast steel in corrosion fatigue strength and has superior resistance to corrosion by seawater and superior weldability. Accordingly, when the cast steel is used as the material of the runner and guide vane of a water turbine for a large-sized seawater pump for the power generation, it is advantageous to reliability and economical efficiency. COPYRIGHT: (C)1985,JPO&Japio
Patent•
22 Aug 1983
TL;DR: In this paper, a hot-rolled steel plate having excellent tensile strength, workability and weldability as a steel plate for automobiles, by combining control of components consisting mainly of C, Si and Mn and specific conditions for hot rolling, is presented.
Abstract: PURPOSE:To provide a hot rolled steel plate having excellent tensile strength, workability and weldability as a steel plate for automobiles, by combining control of components consisting mainly of C, Si and Mn and specific conditions for hot rolling thereby forming fine composite structures of ferrite and pearlite. CONSTITUTION:In the stage of producing a steel plate having 1.6-4.0mm. thickness, >=60kgf/mm. tensile strength and excellent workability and weldability as a steel plate for automobiles, the steel slab contg. 0.15-0.25% C, =1 or >=2 kinds among 0.0005-0.0050% Ca, 0.005-0.015% REM and 0.0005-0.010% Mg as granulating agents of sulfide inclusions is hot-rolled at =15 deg.C/sec average cooling rate and is coiled at 350-560 deg.C, whereby the fine composite structures of ferrite and pearlite are obtained.
Patent•
02 Sep 1983
TL;DR: In this paper, the authors proposed to obtain inexpensively a high-strength thin steel sheet having good ductility and spot weldability by coiling a hot-rolled steel strip contg. at a specific temp.
Abstract: PURPOSE:To obtain inexpensively a high-strength thin steel sheet having good ductility and spot weldability by coiling a hot rolled steel strip contg. a specific ratio of C, Mn, P, Al and N at a specific temp., subjecting the strip to pickling and cold rolling then heating and holding the same under specific conditions and cooling the heated steel sheet. CONSTITUTION:A steel contg., by weight, 0.02-0.15% C, 0.8-3.5% Mn, 0.02- 0.15% P, =50kg.f/mm. tensile strength is thus obtd. at a low cost.
TL;DR: A double-layer electroplated steel sheet has been developed, which is composed of an upper Zn-Fe layer providing good paint adhesion and a lower ZnNi layer intended to improve corrosion resistance as discussed by the authors.
Abstract: A new double-layer electroplated steel sheet has been developed, which is composed of an upper Zn-Fe layer provides good paint adhesion and a lower Zn-Ni layer intended to improve corrosion resistance. Nickel content of 10-15% and iron content more than 80% were desirable.Besides corrosion resistance, the steel sheet exceeded the conventional coated steel sheets also in the properties such as paint adhesion, workability and spot weldability.
Journal Article•
Patent•
09 Dec 1983
TL;DR: In this article, an Al compound soluble in ≥ 0.1N hydrochloric acid is incorporated into each Zn layer of a galvanized steel sheet by 0.01W3% (expressed in terms of Al 2 O 3 ).
Abstract: PURPOSE: To improve the corrosion resistance of a galvanized steel sheet before and after coating and the weldability by incorporating a specified amount of an Al compound soluble in hydrochloric acid into each Zn layer of the steel sheet. CONSTITUTION: An Al compound soluble in ≥0.1N hydrochloric acid is incorporated into each Zn layer of a galvanized steel sheet by 0.01W3% (expressed in terms of Al 2 O 3 ). One or more among Co, Ni, Fe and Cr which are nobler than Zn may be further incorporated by 0.1W30%. The resulting Zn-alumina composite electroplated steel sheet has superior corrosion resistance before and after coating in a corrosive environment such as salt water, so it can be widely used as a rustproof steel sheet for an automobile, household electric appliances, building materials, etc. COPYRIGHT: (C)1985,JPO&Japio
Journal Article•
Patent•
23 May 1983
TL;DR: In this paper, an Al alloy for extrusion contg. 0.4W1.2W 1.3% Si is added and incorporated with 0.05W0.1W 0.5% Mg, and 0.8% Fe and B in total.
Abstract: PURPOSE: To reduce a high-temp. welding crack of an extrudate by incorporating a specific amt. of Mn, Cr and other elements in an existing Al-Mg-Si alloy, subjecting the cast ingot thereof to a soaking treatment and extruding the ingot. CONSTITUTION: An Al alloy for extrusion contg. 0.4W1.5% Mg, and 0.2W1.3% Si is added and incorporate therein with 0.05W0.4% Mn, 0.01W0.5% Cu, 0.01W 0.3% Cr, 0.05W0.8% Fe, and 0.0001W0.3% Ti and B in total. After the cast ingot of such alloy is subjected to a soaking treatment at 450W600°C, the ingot is extruded at 400W550°C to adjust the structure of the thick walled section to the fibrous structure or the structure in which the crystal grain size perpendicular to the extruding direction is ≤200μ. If such extrudate is welded as a base material 1, the generation of a high temp. crack 3 near a weld zone 2 as in convestional practice is prevented. COPYRIGHT: (C)1984,JPO&Japio
Patent•
09 Apr 1983
TL;DR: In this paper, a steel material having superior weldability by deoxidizing molten steel with Ti or a Ti alloy is presented. But the work is limited to the case of rare earth elements.
Abstract: PURPOSE:To manufacture a steel material having superior weldability by deoxidizing molten steel with Ti or a Ti alloy. CONSTITUTION:Molten steel predeoxidized with one or more among Si, Mn and Al as reuired is deoxidized with Ti or a Ti alloy, and one or more among Al, Ca, Mg, Zr and a rare earth element are added to the deoxidized molten steel as required. A steel material having superior weldability, especially a steel material having superior toughness at its weld heat-affected zone can be manufactured.
Patent•
24 May 1983
TL;DR: In this article, the authors proposed a method to improve the strength, toughness and weldability of a coated electrode for Cr-Mo steel by coating a coating material which contains specified weight ratios of metallic carbonates, metallic fluorides and metallic oxides and is limited of component compsn.
Abstract: PURPOSE:To improve the strength, toughness and weldability of a coated electrode for Cr-Mo steel by coating a coating material which contains specified weight ratios of metallic carbonates, metallic fluorides and metallic oxides and is limited of component compsn. at specific weight ratios on an electrode which is limited of component compsn. CONSTITUTION:A coating material contg., by weight, 30-60% metallic carbonates, 10-30% metallic fluorides and 4-20% metallic oxides is coated on the outside circumference of a core wire in such a way that the ratio of the coating material to the total weight of the electrode attains 23-33%, and 0.06-0.12% C, 1.0-1.8% silicon, 0.4-1.0% Mn, 6.5-8.7% Cr, and 1.5-2.0% Mo based on the total weight of the electrode are contained in the covering material and/or the core wire. The reasons for limiting the component compsns. in the covering material and core materials lie in that if the carbon is too much weldability degrades. If the silicon is too little, blowhole are produced in deposited metal and if the silicon is too much, toughness degrades. If the Mn is too much, as- welded hardness is too high. If the Mo is too little, high temp. hardness is not obtained and if the same is too much, the deposition of a ferrite phase increases.
Patent•
16 May 1983
TL;DR: In this paper, a steel contg., by weight, 0.18-0.30% C, = 2 deg.C/sec cooling rate. But the cooling is started within 10min after the rolling when the temp of the plate is >=700 deg.
Abstract: PURPOSE:To obtain the titled steel plate of stable quality by restricting the amount of Mn in a high tension steel having low C equiv. and about 50kg/mm. tensile strength, rolling the steel at a specified rolling finish temp., and cooling the resulting plate to a specified cooling finish temp. CONSTITUTION:A steel contg., by weight, 0.18-0.30% C, =2 deg.C/sec cooling rate. The cooling is started within 10min after the rolling when the temp. of the plate is >=700 deg.C.
Patent•
16 Mar 1983
TL;DR: In this paper, the authors proposed to obtain high tensile steel having high strength and weldability by melting specific low alloy steel consisting basically of C, Si, Mn, solAl to ingot, and hot rolling and acceleratively cooling the same under specific conditions.
Abstract: PURPOSE:To obtain high tensile steel having high strength and weldability by melting specific low alloy steel consisting basically of C, Si, Mn, solAl to ingot, and hot rolling and acceleratively cooling the same under specific conditions. CONSTITUTION:The steel consisting 0.03-0.18% C, =(25.8-0.18Vc)/78 carbon equiv. of accelerative cooling material is melted to ingot. The molten metal is hot rolled at >=20% cumulative draft below the Ar3 point and 650-(Ar3-30) deg.C finishing temp. and is cooled acceleratively at 4-25 deg.C/sec for at least 80 deg.C temp. width down to >=500 deg.C; thereafter the steel is allowed to cool. Thus the high tensile steel having excellent weldability and >=50kg/mm. strength is obtained.
Patent•
13 Sep 1983
TL;DR: In this paper, a specific amt of magnesium in a filler metal to be used for electron beam welding of Al alloys is proposed to assure joint strength, and an adequate content of the magnesium is incorporated in the weld metal without imparing weldability by the above-mentioned method.
Abstract: PURPOSE:To assure joint strength, by incorporating a specific amt of magnesium in a filler metal to be used for electron beam welding of Al alloys CONSTITUTION:An electron beam 2 is irradiated to the butt parts of pipe materials 1, 1 to be welded; at the same time, a filler metal 3 is fed automatically and is added to weld zones The filler metal consists of an Al alloy contg 45-60% magnesium An adequate content of the magnesium is incorporated in the weld metal without imparing weldability by the above-mentioned method and the joint strength equal to or higher than the strength of the base metals is assured