New PDF release: MIG Welding Guide (Woodhead Publishing in Materials)

By Klas Weman, Gunnar Linden

MIG (metal inert fuel) welding is without doubt one of the key strategies in commercial production. The MIG Welding advisor offers accomplished, easy-to-understand assurance of this popular approach. It provides readers with quite a few issues from the alternative of defending gases to filler fabrics, welding gear, and many sensible recommendation. The booklet presents an outline of recent advancements in a number of techniques reminiscent of flux cored arc welding, new high-productive equipment, pulsed MIG welding, MIG-brazing, robot welding functions, and occupational well-being and defense. it's crucial studying for welding engineers, creation engineers, designers, and all these all for commercial production.

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4 Welding current in short arc welding with low inductance (top) and with high inductance (bottom). The aim is to achieve a high, steady short-circuiting frequency, with finely distributed droplets. The arc should strike quickly and cleanly. All this means that the power unit must have the correct dynamic performance. 5 Welding with alternating current Special power units for AC welding, with a square wave current, have been developed. g. TIG or MIG welding. 5 Short-circuiting drop transfer when inductance is low results in increased amount of spatter when the short circuit breaks.

The wire conduit is normally spiral metal but for aluminium a low friction plastic (Teflon) type is recommended. 13 A wire feed unit with wire reel. In order to transfer feeding force into the wire the rollers must be pressed against each other. The force must be enough to maintain a steady feed but must not deform the wire too much. In order to increase the contact surface the drive rolls have a trace that fits to the wire (see Fig. 14). Also the number of driven rolls and their diameter influences the feeding force that can be achieved.

A general tendency is that a higher speed produces a more narrow weld and at an excessively high speed the tolerance for all parameter variations will decrease. By using special techniques, it has been shown to be possible to open up the tolerance box further and allow higher welding speed and deposition rate, see Chapter 8. 5 Inductance It is often possible to adjust the inductance of the power source to fit the wire size to give the right welding properties. The most sensitive is short arc welding.

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