In order to prevent welding deformation of alloy steel pipe, each column joint is symmetrically welded by two people, and the welding direction is from the middle to both sides. After welding one to three layers, reverse gouging should be carried out. After the application of carbon arc gouging, the welding machinery and equipment should be polished, and the welding surface should be nitrided to show the metal texture and prevent cracks from surface carbonization. The outer hole should be welded once, and the other inner holes should be welded once.

In the electric welding of alloy steel pipe, it is necessary to start welding from the arc striking plate and finish welding on the arc striking plate. Cut off, polish and clean after welding.

The alloy steel pipe should be tempered within 12 hours after welding. If the alloy steel pipe cannot be quenched and tempered immediately, the suggestions of heat preservation and slow cooling should be taken. When tempering, the temperature of two thermal resistances should be measured, and the thermal resistances should be welded on both sides of the weld.