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Basic electrodes are tolerant of contamination in the material, producing a tough, crack-resistant weld. better transverse penetration than with solid filler wires. The drawbacks of cored filler wires are: Self-shielded wires produce relatively large quantities of fume. A higher price than for solid wires (does not necessarily mean a higher total cost). Troublesome thermal radiation at higher welding currents. Finishing work required when using slag-forming wires. High productivity gas metal arc welding with solid wires Single-wire methods The productivity of mechanised MIGIMAG welding, using conventional solid filler wires, has constantly improved in recent years.

10. High metallurgical quality in comparison with that of conventional TIG welded materials. 11. Flexibility, due to the ability to perform keyhole welding and melt-in welds using the same equipment. 40 5 MIG/MAG welding Until the 1970s, manual metal arc was the most dominant method of welding. Today MIG/MAG is the obvious leading contender in most industrial countries. 1 The principle ofMIG/MA G welding. 1 shows the principle of MIG/MAG welding. The arc (1) is struck between the workpiece and a metal wire electrode (2) that is continually fed forward into the arc.

Welding galvanised steel produces substantial quantities of fume due to the low boiling point of the zinc. Inhalation of this fume can cause an ague-like response. In these situations, and also when welding in confined spaces where there is insufficient ventilation, it can be appropriate to use a fresh air breathing mask. 19 When welding in confined spaces where there is a risk that the concentration offomes and gases could be too high, the welder must use breathing protection with a supply ofclean air.

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