A thick
pipe welding process of high-strength steel comprises the following steps: firstly, performing
butt joint on two workpieces to be welded according to
welding process requirements and forming an integrated workpiece with symmetrical grooves after
butt joint; secondly, cleaning the surface of the integrated workpiece before
welding, preheating the integrated workpiece, and performing multi-layer multi-channel welding, including a TIG base layer, a TIG filling layer and a TIG covering layer, on the integrated workpiece after preheating is finished; and finally, putting the welded integrated workpiece into a
tempering furnace, and performing
tempering after welding and then cooling to finish thick
pipe welding of the high-strength steel. By the thick
pipe welding process of the high-strength steel, a high-strength steel
thick plate is subjected to automatic multi-layer swinging wire filling TIG welding and the welding problem is effectively solved, so that the welding efficiency and the stability are high, the one-time welding formation is good, the first-class weld joint requirements of the workpieces are met, and the high-speed and high-efficiency welding effect is guaranteed; meanwhile, the process flow is simplified, the welding quality is improved and the welding
processing cycle is shortened, so that the production cost is saved, the labor intensity of workers is reduced and the
working environment is improved.