Semi-automatic circumferential weld welding process for bimetal composite pipe

The semi-automatic circumferential weld welding process comprises joint design, root welding, hot welding, filling welding and cosmetic welding, the welding mode is manual/GTAW, ERNiCrMo-3 welding wires are adopted for semi-automatic butt welding, in the joint design, the welded pipe end is machined into a V-shaped groove, the angle of the groove face is 30 +/-2 DEG C, and the root gap is 3.5 mm-5 mm; in the hot welding process, the welding current ranges from 130 A to 150 A; in the filling welding process, the welding current ranges from 160 A to 180 A. According to the semi-automatic circumferential weld welding process for the bimetal composite pipe, the semi-automatic welding process is adopted, the machining mode and welding parameters of a semi-automatic welding joint are improved, and the prepared circumferential weld joint has good mechanical property and corrosion resistance. 本发明公开了一种双金属复合管的半自动环焊缝焊接工艺，包括接头设计、根焊、热焊、填充焊和盖面焊，焊接方式为手工/GTAW，采用ERNiCrMo-3焊丝进行半自动对接焊，接头设计中，焊接管端加工为V型坡口，坡口面角度为30±2℃，根部间隙为3.5mm-5m