Girth welding method of duplex stainless steel bimetal composite pipe
A bimetallic composite pipe, duplex stainless steel technology, applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc. The effect of high performance, high welding qualification rate and balanced welding seam
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[0024] The girth welding method of the dual-phase stainless steel bimetallic composite pipe of the present invention comprises the following steps:
[0025] The first step, groove treatment: such as figure 1 As shown, the duplex stainless steel bimetal composite pipe is composed of a duplex stainless steel lining pipe 2 with a wall thickness of 0.6-2mm and a carbon steel base pipe 1 set outside the lining pipe 2; The surface is processed with a V-shaped groove, and the angle α of the groove is 45-55°, and the length of the part of the lining pipe 2 extending beyond the base pipe 1, that is, the blunt edge 6, is 2-3 mm. In this embodiment, the base pipe 1 is made of 20 steel and its wall thickness is 7 mm. In practice, the base pipe 1 can also be made of 20G steel, L245NB pipeline steel or L360 pipeline steel; the material of the lining pipe 2 is 2205 duplex stainless steel And its wall thickness is 2mm. First, the welding surface of the base pipe 1 is processed into a groove...
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