Showing papers on "Electric resistance welding published in 1967"

Welding of aluminum and aluminum alloys

Abstract: : The purpose of this report is to summarize the present state of aluminum-welding technology. The major topics covered are: Basic metallurgy of various heat-treatable and non-heat-treatable alloy classes; welding processes used for joining aluminum with emphasis on newer processes and procedures which are considered important in defense metals industries; welding characteristics of various alloys; comparison of tensile properties, cracking tendencies, notch toughness, and stress-corrosion characteristics of various weldments; dissimilar metal welds; and causes of porosity and cracking of aluminum welds and the effect of porosity on weld strength. (Author)

Electron-beam apparatus and method of welding with this apparatus

Abstract: Electron-beam welding apparatus, particularly for welding work in the atmosphere outside of the vacuum chamber 33 (FIG. 1 in which the electron-beam is generated, which includes facilities for producing X-rays for monitoring of the welds. Such X-rays are produced by projecting the electron beam which serves for welding on an X-ray target 61 at intervals (FIGS. 2, 2A) during the welding operation or during an interval following the welding (FIG. 1); the X-rays may also be produced by deflecting the welding electron beam at intervals on the target (FIG. 5) or by an auxiliary beam generated within the same container as the welding beam (FIG. 4). Where there is an auxiliary beam, the Xray monitoring of the weld may take place continuously as the welding progresses. A method of welding with an electron beam in which the welds are monitored by radiographic analysis while the welding is progressing. An X-ray generator 171 (FIG. 6) in which an electron beam E, which is projected outside of the vacuum chamber in which the electron-beam is generated, produces X-rays by impinging on a consumable target 191 preferably of relatively small dimensions.

Solid composite backing structure for single welding

Abstract: A backing material, for use in butt or fillet welding, adapted to be placed and retained under or behind a joint to improve the quality of the weld at the root, the structure being composed of layers of different granular fluxes solidified into a rigid formation.

Method of assembly of bi-metallic tubes by welding without filler metal

Abstract: 1,156,780. Welding by fusion. COMMISSARIAT A L'ENERGIE ATOMIQUE. 15 Aug., 1967 [25 Aug., 1966 (2)], No. 37429/67. Heading B3R. [Also in Division F2] In connecting bi-metallic tubular elements, by connecting the outer tubes 1 to each other and the inner tubes 2 to each other, the inner tubes are connected by fusion welding without the use of filler metal. Outer tubes 1 of mild steel may be lined with inner tubes of nickel or aluminium alloy. After the inner tubes 2 have been joined by argon shielded arc welding, a two-part collar 6, Fig. 4, may be similarly welded to the outer tubes 1. A screw 9, provides access to the space 7 surrounding the weld 5 between the inner tubes 2, to permit inspection of the weld 5 or allow the space 7 to be filled with inert gas to protect the weld 5. In a modification, Fig. 6, the ends 10 of the inner tubes are flanged prior to welding. Flanges 6 threaded on the ends of the outer tubes 1 are fusion welded without filler metal to connect the outer tubes 1. In a further modification the flanges 6 are bolted together.

Improvements in the resistance welding of coated parts

Abstract: 1,066,625 Welding FORGES DE STRASBOURG Aug 13, 1964 [Nov 25, 1963], No 32971/64 Heading B3R In a process for the resistance welding of parts which are provided with a protective coating, there is projected on to the parts in the region of the weld, during the welding operation, a fluid containing a substance which is a good electrical conductor A machine for carrying out the method comprises a pair of roller electrodes 3, 4, in contact with the parts to be welded 1, 2, which travel in the direction of the arrow "f" A sump 12 contains the fluid which is delivered by a pump 10 to nozzles 5 and 6, the rate of flow is controlled by a by-pass valve 15 and the temperature of the liquid by a refrigerator coil 16 Liquid is collected from the machine by a trough 13 and returned to the tank for re-circulation A stirrer 17 is driven by a motor 18 and may also be arranged to have an additional vertical reciprocating motion The substance contained in the fluid comprises finely-divided copper coated with a macro-molecular compound The compound is prepared by mixing the copper with a solution of collodion in acetone, evaporating the acetone and grinding the mass thus obtained The pulverulent substance resulting from this operation is then mixed with water containing a wetting agent to prevent agglomeration

Integration of NASA-sponsored studies on aluminum welding

Abstract: The results are presented of numerous studies relating to aluminum alloy welding. The subjects covered include: (1) effects of porosity on weld joint performance, (2) sources of porosity, (3) weld thermal effects, (4) residual stresses and distortion, and (5) manufacturing process system control.

Method and device for the electrical resistance seam welding of surface-refined sheet steels,more particularly of hot-galvanized sheet steels

Abstract: 1,186,212. Welding by pressure. PECO ELECTRISCHE SCHWEISSMASCHINENFABRIK RUDOLF BOCKS. 11 April, 1967 [23 April, 1966], No. 16488/67. Heading B3R. In roller electrode resistance seam-welding, a steel strip is guided between the contact surface of each roller and the work and simultaneously a fluid under pressure is directed on to the places of contact of the rollers with the steel strips. An apparatus comprises an upper arm 1, Fig. 1, carrying an electrode roller 2 and a lower arm 6 carrying an electrode roller 7, ungalvanized steel strips being guided from spools 3, 8 by guides 4, 9 into contact with the rollers. Conduits 11, 12 are provided in pairs to supply air or water to each side of the rollers. In operation, hot-dip zinc galvanized steel sheets 15, 16, Fig. 4, are fed between the electrode rollers 2, 7 with the uncoated steel strips between the rollers and the zinc coatings 20, 17 and the strips become welded to the sheets and the sheets become welded together. The jets of water or air from nozzles 13, 14 remove liquid zinc, zinc vapour and zinc oxide. The steel strips which may be of stainless steel when a fuel tank for an automobile is being produced are narrower than the width of the contact surfaces of the electrode rollers. Lead coated sheets may be similarly welded.

Weldability of tantalum alloys - ii.

Abstract: : A study of the weldability of complex tantalum alloys developed in recent alloy-development programs was conducted. The effects of a number of factors on fusion-weld ductility and crack susceptibility were evaluated. The results showed that ductile fusion welds can be made in many complex tantalum alloys, including Ta-10W-1Zr-Y, Ta-7W-3Re-1Hf-0.2Zr, and Ta-6.6W-3Re-3Hf, provided that the base material is of good quality and that proper machine welding procedures are used. The factors which most significantly affect the as-welded ductility of welds in these alloys are base-material alloy content, interstitial content, and fabrication history. The presence of yttrium is not necessary to obtain good as-welded ductility in these highly alloyed materials. However, there are indications that yttrium improves the resistance of welds to contamination during and after welding. Fusion welds in many tantalum alloys, including Ta-10W-2.5Mo and Ta-17W, can be made ductile by means of appropriate postweld heat treatment. Tensile joint efficiencies for welded tantalum alloys such as Ta-10W-1Zr-Y and Ta-6.5W-3Re-1Hf-0.4Zr-Y range from 80 to 100 percent at room temperature and from 90 to 100 percent at 3500 F. The highest as-welded tensile strength at 3500 F obtained in the program was 15.2 ksi for Ta-6.5W-3.1Re-1.2Hf-0.4Zr-0.002Y. (Author)

Square-Wave Welding

Abstract: Over the past few years, several research programs have been conducted to determine the effect of welding current waveform characteristics on weld qualities.[1]-[3] It was recorded that gradual weld quality improvement was achieved as the output-current waveshape more nearly approached that of a symmetrical square wave. This work resulted in issuance of a patent on such a current waveform control.[4] A square-wave ac control unit has been developed and evaluated and its advantages, along with some practical information regarding weld quality, will be discussed.

Welded FM Connection for Aluminum Pipe Cables

Abstract: The use of aluminum for cable conductors has been hampered by the lack of an acceptable splicing technique. A method whereby the aluminum conductors of a 950-kcmil, 72-kV pipe cable were spliced by means of metal inert gas (MIG) welding and a field machined (FM) compression sleeve is described. The design criteria and the practical problems encountered during the development, as well as their solutions, are presented. The welding operation and connector application are fully described. Test data are included for strength and conductance in the splice.

Sliding current leads to machines intended for seam resistance welding

Abstract: A SLIDING CURRENT LEAD FOR MACHINES FOR SEAM RESISTANCE WELDING COMPRISES NONROTATABLE SLIDING CONTACT ADAPTED FOR CONNECTION WITH A CURRENT-CARRYING BUS BAR AND A WORKING ELECTRODE FIXED ON A ROTATABLE SUPPORT SHAFT WHICH IS ROTATABLE IN BEARINGS ISOLATED FROM THE BODY AND SAID CURRENT-CARRYING BUS BAR. THE NONROTATABLE SLIDING CONTACT IS ARRANGED BETWEEN THE CURRENT-CARRYING BUS BAR AND THE WORKING ELECTRODE AND IS APPLIED AGAINST THE LATTER BY MEANS OF A CURRENTCARRYING RESILIENT MEMBER WHICH ELECTRICALLY CONNECTS THE NONROTATABLE SLIDING CONTACT AND THE CURRENT-CARRYING BUS BAR AND URGES THE SLIDING CONTACT AGAINST THE WORKING ELECTRODE. A COOLING LIQUID PASSES THROUGH THE SLIDING CURRENT LEAD AND APPLIES ADDITIONAL CONTACT FORCE ON THE RESILIENT MEMBER.