First of all, the welded steel pipe first clean up the oil, paint, water, rust, etc., and then according to the wall thickness of the groove, thicker to open larger, thin to open smaller (angle grinder), and then Is the gap of the product, usually 1 to 1.5 times the diameter of the electrode or wire, if you groove accidentally open big words can be appropriate to stay smaller. Point welding at least three o'clock, generally four points better work. Welded steel pipe should be half the time half of the welding, the best starting point more than a centimeter at the end, so good from the opposite connector. If the pipe wall thickness, it should be stratified, at least two layers, the first layer of the entire weld before welding the second layer. This information source
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