Welding, as a special kind of work, especially engaged in pipeline welding welders, overhead welding, overhead welding, vertical welding, horizontal welding, and other positions of welding is common, welding eighteen martial arts is difficult, welders by physical, energy suffering.
In brief, pipe, welding material (baking, heat preservation), welding joint treatment (cleaning, type of break), welding precautions (current, voltage, influence of gas welding wind, rain and snow weather)
At present, the commonly used methods of pipe welding include electrode arc welding (SMAW), submerged arc welding (SAW), tungsten gas shielded arc welding (GTAW), GMAW, FCAW and down-welding.
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