2205 dual-phase steel automatic welding method

Abstract

The invention relates to a 2205 dual-phase automatic welding method. The method includes the steps that longitudinal seams and circular seams of a tube body are welded by adopting a PAW/TIG dual-gun switching longitudinal seam automatic welding system and a PAW/TIG dual-gun switching circular seam automatic welding system. When the slag thickness of the 2205 dual-phase stainless steel tube body is4-10 mm, an I-shaped groove type is adopted, a groove is planned to be a straight edge in a straight-edge butt-jointing mode, and automatic PAW is used for self fusion welding without filler wires once and then is switched to automatic argon arc welding for covering with the filler wires once; and when the slab thickness of the 2205 dual-phase stainless steel tube body is 10-15 mm, a Y-shaped joint groove type is adopted, the groove angle is 75 degrees, the unilateral is 37.5 degrees, the truncated edge is 6 mm, and the automatic PAW is used for self fusion welding without the filler wires once, and then is switched to automatic GTAW for covering with the filler wires 2-4 times until full welding. According to the 2205 dual-phase automatic welding method, back gouging is not needed, automatic welding is achieved, the welding production efficiency is high, no spatter, powder, arc light, and noise exist in the welding process, shapes of welding lines are neat and beautiful, and the quality of whole equipment is improved.

Description

technical field [0001] The invention relates to a welding method, in particular to an automatic welding method for 2205 dual-phase steel. Background technique [0002] 2205 duplex stainless steel equipment is widely used in the polyolefin equipment manufacturing industry, especially the core equipment steamer, fluidized bed dryer, steamer cyclone separator and dryer cyclone separator in the polypropylene plant. Chloride ions, all materials in contact with the medium of the equipment are made of 2205 dual-phase steel. Since the polyolefin industry has strict requirements on the chemical composition, mechanical properties and corrosion resistance of 2205 duplex steel welds, the traditional welding methods in this industry are manual electrode welding and argon arc welding. In order to ensure the quality of welded joints, only small-standard welding can be used for pressure-bearing welds, and electrodes above Φ4.0 mm are not recommended; and manual welding requires back cleani...

AI Technical Summary

Problems solved by technology

In order to ensure the quality of welded joints, only small-standard welding can be used for pressure-bearing welds, and electrodes above Φ4.0 mm are not recommended; and manual welding requires back cleaning, which is generally manual electric grinding, and the working environment is very poor

At the same time, the existing traditional manual welding welding technology has always had shortcomings such as high labor intensity, low production efficiency, arc dust pollution and poor appearance quality of welds.