Multi-wire submerged-arc multi-layer multi-pass welding process
A multi-layer, multi-pass, welding process technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems that cannot meet the multi-layer and multi-pass welding of large and thick plates, the thickness of the plate to be welded is small, and there is no low temperature toughness. , to achieve the effect of reducing post-weld correction and deformation adjustment workload, controlling welding deformation, and preventing welding cracks
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[0020] Welding for KCROP project jacket pipe making. The material of the leg rack is API 2H Gr.50. This steel is of the same strength level as the carbon steel of D36 or E36, and the wall thickness is 38mm to 60mm. It is welded using the welding process of the present invention:
[0021] 1. Preparation before welding:
[0022] ①Preparing the groove, grinding group to match the groove, the groove form is asymmetrical X type, the groove gap is 0-1mm, the blunt edge is 1-2mm, and the groove and the range of 25mm on both sides are cleaned, until the metallic luster is revealed;
[0023] ② Preheating before welding, preheating the welding part and its surrounding area within 75mm, the minimum preheating temperature is 65°C, and the preheating method adopts flame heating;
[0024] ③ Welding material: JW-1 welding wire, diameter 4.0mm, SJ101 flux.
[0025] 2. Using multi-wire submerged arc multi-layer multi-pass welding process for welding,
[0026] (1) The maximum interlayer tem...
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