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2. Equipment: welding unit
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Electric generator
MIG/MAG welding uses direct current. The positive pole is at the electrode (DCEP polarity). MIG/MAG welding generators are said to have a horizontal or constant voltage characteristic. This property is important in explaining the semi-automatic nature of the process. In arc welding, arc height is linked to voltage: an increase in the gap between cathode and anode generates an increase in voltage, and vice versa. Figure 2 shows two arc characteristics associated with a MIG/MAG generator. Their intersections represent the operating points. It can be seen that a small change in arc voltage (or arc height Δh ) in turn generates a large change in current ΔI. This parameter is linked to the unwinding speed. Thus, the unwinding speed will increase...
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Equipment: welding unit
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Bibliography
Websites
Afnor (Association française de normalisation) website http://www.afnor.org
INRS (Institut national de recherche et de sécurité) website http://www.inrs.fr
Standards and norms
- Source de courant pour soudage manuel à l'arc à service limité - NF EN 50060/A1 - 03-95
- Arc welding equipment – Part 1: welding power sources - NF EN 60974-1 - 11-12
- Arc welding equipment – Part 6: limited-service equipment - NF EN 60974-6 - 05-11
- Welding consumables – General product standard for filler metals and fluxes for fusion welding of metallic materials - NF EN 13479 - 09-05
- Welding...
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