Showing papers on "Shielded metal arc welding published in 1971"

Production of an improved non-austenitic steel weld deposit

Abstract: A method of producing an improved non-austenitic steel weld deposit characterized by superior toughness in the Charpy V-notch impact test by melting a covered ferrous low hydrogen arc welding electrode consisting of a current conductive core and a limefluoride coating, which method consists of proportioning the core and coating components containing metallic and oxide forms of the basic metals of the group consisting of lithium, sodium, potassium, cesium, magnesium, calcium, strontium and barium and of the acid metals of the group consisting of aluminum and silicon so that when all components are melted together under the influence of an electric arc they produce a weld metal deposit and a welding slag with a basicity or mole ratio of oxide of basic metal to oxide of acid metal of at least 2.2 and restricting the sources of metallic and oxide forms of titanium in the core and coating components so that the weld metal deposit contains less than 0.07 percent titanium.

Arc welding electrode and process for stainless steel

Abstract: There is disclosed an arc welding process for stainless steel and a flux-cored electrode particularly useful therein which is formulated of components having relatively low moisture absorptivity.

Electric arc welding process

Abstract: An electric arc welding process for welding together sheets of unalloyed or low alloyed structural steel utilizes a consumable wire electrode under shielded gas and is characterized in that the welding is conducted with a voltage of 25 to 40 V at a current density of 300-400 A/mm2 wire electrode cross-section with the wire electrode having a diameter of about 0.8-1.2 mm and the shielded gas containing at least some CO2.

An Investigation Into the Factors Contributing to Welding of Contact Electrodes in High Vaccum

Abstract: The effect of a vacuum environment on welding of Cu-Bi (0.3%) electrical contacts has been investigated. The experiments have been planned in order to differentiate between the effects of cold welding, diffusion welding and percussion welding. Cold welding has no affect on newly prepared electrodes, but after the electrodes have been arced appreciably a small residual cold weld force is experienced. The diffusion weld strength is strongly dependent upon the contact force, the electrode temperature and the time in contact. The strongest weld forces are measured in the percussion weld experiment where the electrodes experience a high current prestrike arc as they close. It is also found in this study that the weld force decreases rapidly after the electrode faces are exposed to the residual gases in the vacuum. These results are discussed in terms of the chemisorption of residual gases and the real area of electrical contact. The effects of the change in nature of the electrode surfaces are discussed and a satisfactory qualitative explanation of the results is reached.

Short-circuit inert gas consumable electrode process using additions of 10-14% nitrogen

Abstract: A gas shielded consumable electrode welding process for welding of materials such as 9 percent nickel steels and nitrogen stainless steels with relatively inexpensive stainless steel wire which includes utilizing a shielding gas of 10-14 percent nitrogen balance argon, helium or mixtures thereof, and a short-circuit arc deposition as the arcing process.

Effect of Welding Atmospheres and Welding Polarity on the Nitrogen Content of Weld Metals

Abstract: Mild steel and stainless steel were welded in controlled arc atmospheres.Effect of nitrogen partial pressures in the welding atmospheres of N2, N2-Ar, N2-O2, Air, N2-CO2 or N2-H2 and welding polarity on the nitrogen content of weld metals was systematically studied.The main results obtained are summarized as follows:1. The nitrogen content of weld metals made in neutral or reducing atmospheres such as N2-Ar or N2-H2 increases with the increase of the partial pressure of nitrogen.2. The co-existence of oxidizing gas with N2 in the arc atmosphere increases greatly the nitrogen content of weld metals.3. Anomalous absorption of nitrogen was observed at low pressures of the arc atmospheres.4. The nitrogen content of mild steel weld metals made in N2, N2-Ar, or N2-H2 welding atmospheres is not influenced by welding polarity, while the nitrogen content of stainless steeel weld metals made with DCSP is more than that with DCRP.5. In oxidizing atmospheres such as N2-O2 or N2-CO2, weld metals absorb much more nitrogen with DCRP than with DCSP.

Anti-hygroscopic arc welding coated electrode and the process for producing the same

Abstract: AN ANTI-HYGROSCOPIC ARC WELDING COATED ELECTRODE CONTAINS, AS A BINDER FOR THE COATING MATERIAL OF THE ELECTRODE, A GLASS POWDER HAVING A SOFTENING POINT OF FROM 350* TO 550*C., WHICH MELTS AND COVERS THE GRAINS OF THE COATING MATERIAL, WHEN HEATED TO A TEMPERATURE ABOVE THE SAID SOFTENING POOOINT, SO AS TO FORM VITREOUS FILMS THEREAROUND.

Arc welding flux

Abstract: A WELDING FLUX WHICH COMBINES THE ADVANTAGE OF EXCELLENT SLAG REMOVAL IN MULTIPLE PASS DEEP GROVE WELDING AND IS "NEUTRAL" IN THAT THE WELD METAL ANALYSIS IS RELATIVELY UNAFFECTED BY CHANGES IN ARC VOLTAGE.

Weld support for welding apparatus

Abstract: A weld support for a gas shielded metal arc welding apparatus is disclosed as having a welding block provided with a relatively flat surface, a resilient rubber strip around the periphery of the flat surface, a welding chamber within the block and a plurality of gas exhaust passages connecting the welding chamber and the exterior of the block and having bends intermediate their extremities. A shielding chamber is affixed to the welding block around an opening into the welding chamber for receiving and holding a nozzle of the welding apparatus perpendicular to the flat surface of the welding block and enclosing shielding gas fed through the nozzle into the welding chamber. When a weld is being made, the welding block is held against the material being welded to maintain the welding apparatus perpendicular to the material. The rubber strip assists in maintaining this perpendicularity by accommodating any irregularities in the surface of the material. The rubber strip also prevents flow of molten weld material away from the vicinity of the weld spot. The bend in the gas exhaust passages prevent weld spatter from escaping from the welding chamber.

Chemical welding material

Abstract: THE INVENTION PROVIDES A CHEMICAL WELDING COMPOSITION MATERIAL OF A POWDERED LIGHT METAL AND A METAL OXIDE MOLDED UNDER PRESSURE INTO A SOLID FORM, THEREBY PRODUCING A MATERIAL CAPABLE OF PROVIDING CONCENTRATED HEAT TO WELD WORKS QUICKLY, AND ENSURING ADAPTABILITY OF THE COMPOSITION MATERIAL FOR WORKS DIFFICULT TO WELD, SUCH AS WITH DEEP HOLES, NARROW CURVED PARTS, OR LENGTHY WORKPIECES, WITHOUT NEED FOR SPECIAL PROCEDURES OR TOOLS.

On Underwater Plasma Welding

Abstract: Since plasma arc has been considered to be a suitable heat source for wet welding owing to the following factors, the feasibility of underwater welding by it is studied.(1) Plasma arc co-operating with plasma jet can be generated easily and kept in stable state in water, and is less sensitive to variations in torch-to-work spacing.(2) As energy transferred from plasma arc to work is highly concentrated, fusion efficiency of work is high.(3) Plasma arc is constricted by torch nozzle, so its directional property is excellent.(4) Plasma jet, kept operating all the diving time, acts as illuminating light source and makes it easy for the welder to work in water.As the first step to develop the process, preliminary experiments on some of the above-mentioned factors are made in simple welding environment, such as in city water and at water depth of 20 cm. And then butt welding and fillet lap welding under the conditions adopted according to information obtained in the preliminary experiments are done by using steel as base metal for a welded structure of 6 mm in thickness. Results of experiments show that underwater welding by plasma are (semi-transferred type plasma jet, i.e., plasma jet co-operates with plasma arc) can be done easily and stably and the weld has excellent properties in both tensile strength and notch toughness, though the weld metal includes blowholes to some extent. In conclusion, it is ascertained that this process can be put to practical use.

Method of electric-arc welding of tubular products with magnetic control of the arc

Abstract: A method for the electric-arc welding of tubular products, in which a magnetic field is made to act upon the arc so as to control the process of welding, the method characterized in that the magnetic field is established in the welding zone by passing an electric current along the workpiece from a separate current source.

Study on the Underwater Welding (Report 1)

Abstract: Underwater welding was experimentally carried out in a water box by coated electrodes and semiautomatic CO2 welding. And It was investigated the occurrence of blowhole was affected by various welding parameters.The following results were obtained:1) Sound deposited metal and welded joints were obtained under flat, horizontal and vertical positions from every coated electrode except the low hydrogen type one. Kinds of power sources and water proofing coatings of electrodes had no special effect on appearance and soundness of bead.2) Welded joints by coated electrodes were superior in tensile strength but inferior in ductility to the mild steel base metal.3) It was difficult to get a sound weld metal by low hydrogen type electrode under water. Blowholes in weld metal were remarkable in all welding current and arc voltage ranges.4) It was also considerably difficult to obtain a weld metal quite free from blowholes by underwater semiautomatic CO2 welding.

Method for welding manganese alloys

Abstract: A method for welding alloys of high manganese content to avoid the development of weld flash is shown to comprise the steps of resistance welding the manganese alloy under conditions of temperature and pressure which are adequate for forcibly expelling manganese oxide from the surface of the alloy. The resistance welding is performed while a thin layer of tin is disposed at the weld location, the tin being melted but remaining fluid without significant vaporization thereof at the welding temperature for restraining expelled manganese oxide at the extremities of the weld location to prevent the formation of weld flash.

Arc starting stud welding method

Abstract: An arc stud welding method providing a metal piece between a stud and a base metal for generating an arc and for deoxidation so as to improve the arc generation effect while protecting the arc from the atmosphere whereby the characteristics of the welded metal is improved. Further, using said metal piece the length of the arc can be maintained as constant so that the uniformity of the stud welding is improved.

Fume Extraction When Welding Zinc-Coated Steels

Abstract: Methods of fume extraction have been developed for use when welding steels coated by hot dip galvanizing, by zinc metalizing, or with zinc-rich paints. For gas-shielded metal arc (e.g., MIG-CO2 welding) processes a fume extractor has been developed which surrounds the welding gun so that fumes are removed close to their point of origin. The zinc oxide fumes, which are completely removed, can be exhausted to the outside atmosphere, or they can be collected.

Flux cored tubular electrode for gas shielded electric-arc welding

Abstract: A continuous electrode for shielded-gas welding and building-up of steels consisting of a powdery core in a steel envelope, the core comprising taken in the following per cent by weight: FLUORITE CONCENTRATE15-26MARBLE50-10FERROMANGANESE4565FERROSILICON10 -35ALUMINA20-60MANGANESE ORE05-15 THE BALANCE BEING IRON POWDER The electrode having a core composition according to the present invention features good welding and technological characteristics and provides for high mechanical properties of the weld joint metal

Welding electrode for continuous welding

Abstract: A continuous welding electrode for welding low- and medium-alloyed high-strength steels which comprises in percent by weight carbon 0.18-0.25, manganese 2.5-3.5, silicon 0.4-0.8, chrome 1.5-2.0, nickel 1.0-1.3, tungsten 0.9-1.3, molybdenum 0.4-0.5, balance iron and provides for making high-strength weld joints having high impact strength at a temperature of up to -100 DEG C.