Organizational and direct support maintenance repair parts and special tools list : welding set, arc, inert gas shielded, water cooled, aluminum welding, general purpose (Airco model 23511209), FSN 3431-731-4163.

"December 1970."

Operator's, organizational, DS, and GS maintenance manual : welding set, arc, inert gas shielded, air cooled, metal lined gun for 3/64 in. wire (Westinghouse model SA-136), FSN 3431-121-5878.

"August 1969."

Operator, organizational, direct support, and general support maintenance manual : welding machine, arc, AC/DC, 300 amp, transformer rectifier, constant current, base mounted (Eutectic Corp. model MD301 FED), FSN 3431-235-4728.

"September 1970."

Operator, organizational, direct support, and general support maintenance manual, including repair parts and special tools list : welding machine, arc, general and inert gas, shielded, transformer-rectifier type, AC and DC, 300 ampere rating at 60% duty cycle (Harnischfeger model DAR-300HFSG), FSN 3431-984-3401, (Harnischfeger model 2100H2007), FSN 3431-926-3746.

Includes index.

Organizational maintenance repair parts and special tools list : welding set, arc, inert gas shielded, plastic or metal lined gun, for 3/64 in. wire, DC, 115V (Westinghouse model SA-135), FSN 3431-879-9709.

Includes index.

Operator, organizational, direct and general support and depot maintenance manual : welding machine, arc, generator, gasoline engine driven, 300 amp, DC (Libby model LE-300) FSN 3431-810-9696, (Libby model LEW-300) FSN 3431-991-2961, (Libby model LEB-300) FSN 3431-072-0327.

Includes index.

Direct and general support and depot maintenance repair parts and special tools list : welding machine, arc, generator, electric motor driven, AC, 220V, 3 phrase [i.e. phase], 60HZ, single operator, remote control, 300 amp DC arc, wheel MTD ....

"December 1968."

Operator, organizational, direct and general support, and depot maintenance manual (including repair parts) : welding machine, arc, inert shielded, transformer, 300 amp, 10 to 400 amp AC straight polarity, 10 to 00 amp DC reverse polarity (Midstates model MAG 00 AC/DC T 14) FSN 3431-862-6670.

"February 1967."

Operator, organizational, direct and general support, and depot maintenance manual : welding machine, arc, general and inert gas shielded transformer, 300 amp, 5 to 460 amp AC, 5 to 350 amp DC (Miller model 330A/B/SP) FSN 3431-620-0858.

"March 1969."

Direct and general support and depot maintenance repair parts and special tools lists : welding machine, arc, generator, GED, 300 amp, DC (Libby Welding models) (model LE-300) FSN 3431-810-9696, (model LEW-300) FSN 3431-991-2961, (model LEB-300) FSN 3431-072-0327.

"January 1971."

Direct and general support and depot maintenance repair parts and special tools lists : welding set, arc, inert gas shielded, plastic or metal lined gun; for 3/64 in. wire; DC, 115V., (Linde model SWM-9-A), FSN 3431-972-7672.

"May 1970."

Operator, organizational, field, and depot maintenance manual : welding machine, arc, generator, elec [sic] motor driven, AC, 220V, 3 phase, 60 cycle, single operator, remote control, 300 amp DC arc, wheel mounted ...

"August 1963."

The effect of metal transfer stability (spattering) on fume generation, morphology and composition in short-circuit MAG welding

The main objective of this work was to evaluate the hypothesis that the greater transfer stability leads also to less volume of fumes. Using an Ar + 25%CO2 blend as shielding gas and maintaining constant the average current, wire feed speed and welding speed, bead-on-plate welds were carried out with plain carbon steel solid wire. The welding voltage was scanned to progressively vary the transfer stability. Using two conditions of low stability and one with high stability, fume generation was evaluated by means of the AWS F1.2:2006 standard. The influence of these conditions on fume morphology and composition was also verified. A condition with greater transfer stability does not generate less fume quantity, despite the fact that this condition produces fewer spatters. Other factors such as short-circuit current, arcing time, droplet diameters and arc length are the likely governing factors, but in an interrelated way. Metal transfer stability does not influence either the composition or the size/morphology of fume particulates. (c) 2014 Elsevier B.V. All rights reserved.

Tandem-GMA Welding of Low Alloy Structural Steel

The Tandem-GMAW method is the latest development as the consequences of improvements in the welding methods. The twin-wire and then the Tandem-method with the separate power sources has got a remarkable place in the welding of many types of materials with different joint types. The biggest advantage of Tandem welding method is the flexibility of choosing both the electrodes of different types from each other according to the type of the parent material. This is possible because of the feasibility of setting the separate welding parameters for both the wires. In this thesis work the effect of the variation in three parameters on the weld bead in Tandem-GMA welding method is studied. Theses three parameters are the wire feed rate in the slave wire, the wire feed rate in the master wire and the voltage difference in both the wires. The results are then compared to study the behaviour of the weld bead with the change in these parameters.

The effects of some variables on CO2 laser-MAG hybrid welding

The CO2-laser-MAG hybrid welding process has been shown to be a productive choice for the welding industry, being used in e.g. the shipbuilding, pipe and beam manufacturing, and automotive industries. It provides an opportunity to increase the productivity of welding of joints containing air gaps compared with autogenous laser beam welding, with associated reductions in distortion and marked increases in welding speeds and penetration in comparison with both arc and autogenous laser welding. The literature study indicated that the phenomena of laser hybrid welding are mostly being studied using bead-on-plate welding or zero air gap configurations. This study shows it very clearly that the CO2 laser-MAG hybrid welding process is completely different, when there is a groove with an air gap. As in case of industrial use it is excepted that welding is performed for non-zero grooves, this study is of great importance for industrial applications. The results of this study indicate that by using a 6 kW CO2 laser-MAG hybrid welding process, the welding speed may also be increased if an air gap is present in the joint. Experimental trials indicated that the welding speed may be increased by 30-82% when compared with bead-on-plate welding, or welding of a joint with no air gap i.e. a joint prepared as optimum for autogenous laser welding. This study demonstrates very clearly, that the separation of the different processes, as well as the relative configurations of the processes (arc leading or trailing) affect welding performance significantly. These matters influence the droplet size and therefore the metal transfer mode, which in turn determined the resulting weld quality and the ability to bridge air gaps. Welding in bead-onplate mode, or of an I butt joint containing no air gap joint is facilitated by using a leading torch. This is due to the preheating effect of the arc, which increases the absorptivity of the work piece to the laser beam, enabling greater penetration and the use of higher welding speeds. With an air gap present, air gap bridging is more effectively achieved by using a trailing torch because of the lower arc power needed, the wider arc, and the movement of droplets predominantly towards the joint edges. The experiments showed, that the mode of metal transfer has a marked effect on gap bridgeability. Transfer of a single droplet per arc pulse may not be desirable if an air gap is present, because most of the droplets are directed towards the middle of the joint where no base material is present. In such cases, undercut is observed. Pulsed globular and rotational metal transfer modes enable molten metal to also be transferred to the joint edges, and are therefore superior metal transfer modes when bridging air gaps. It was also found very obvious, that process separation is an important factor in gap bridgeability. If process separation is too large, the resulting weld often exhibits sagging, or no weld may be formed at all as a result of the reduced interaction between the component processes. In contrast, if the processes are too close to one another, the processing region contains excess molten metal that may create difficulties for the keyhole to remain open. When the distance is optimised - i.e. a separation of 0-4 mm in this study, depending on the welding speed and beam-arc configuration - the processes act together, creating beneficial synergistic effects. The optimum process separation when using a trailing torch was found to be shorter (0-2 mm) than when a leading torch is used (2-4 mm); a result of the facilitation of weld pool motion when the latter configuration is adopted. This study demonstrates, that the MAG process used has a strong effect on the CO2-laser-MAG hybrid welding process. The laser beam welding component is relatively stable and easy to manage, with only two principal processing parameters (power and welding speed) needing to be adjusted. In contrast, the MAG process has a large number of processing parameters to optimise, all of which play an important role in the interaction between the laser beam and the arc. The parameters used for traditional MAG welding are often not optimal in achieving the most appropriate mode of metal transfer, and weld quality in laser hybrid welding, and must be optimised if the full range of benefits provided by hybrid welding are to be realised.