Mig Welder General Procedure
The process of welder MIG / MAG wire is a continuous process in which protection of the weld pool is ensured by a gas range, flowing from the torch on the workpiece. The fact that it is a continuous wire process ensures high productivity in the procedure itself, and the presence of gas allows operation without slag (both of these features increase the cost of the proceedings against the welder electrode). On the other hand, a station for MIG / MAG is necessarily composed of the following components (see figure opposite):
1. Torch with dual function: to shoot the arc between the wire and the piece and bring the shielding gas on weld pool
2. Workpiece
3. Current source of arc (in modern machines The characteristics of arc is done electronically)
4. Advancement mechanism and control of wire
5. ASPO avvolgifilo
6. Cylinder of shielding gas
The presence of all these components, of course, greatly increases the cost of a welder machine for MIG / MAG machine against a welder electrode (which in practice is little more than a voltage source with characteristic drooping).
And with the continuous filaments is possible to have current densities higher than those borne by coated electrodes (in the latter an excessive current density causes the cracking of the coating, due to different coefficients of expansion between soul and metal coating itself), then you can get more penetration, that is filling the joint with a smaller number of passes.
The MIG / MAG, as all procedures with continuous wire, is a undeclared processes derived from the arch, but towards the latter has the advantage that the operator can hold the bow under direct observation, so it can monitor enforcement proceedings as in the welder electrode (coated electrode and TIG), submerged arc against other advantages are the absence of slag formation and the ability to weld in flat positions
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