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• Time of issue:2022-03-31 08:39
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(Summary description)Option 1: Welding preheating, er80s-b2l welding wire, T1G backing, e8018-b2 welding rod, electrode arc welding cover, local heat treatment after welding. Option 2: er80s-b2l welding wire, T1G bottom welding, e309mo-16 welding rod, welding rod filling arc welding cover, no heat treatment after welding. 2 Preparation before welding The welding method of the test piece using the Q235B steel plate 1 welding material is based on the weldability of the Q235B steel plate and the working characteristics of the high-pressure pipeline on site. The specification is φ32525 Before welding, use an angle grinder to polish the inside and outside of the groove and the edge of the groove within 50mm to reveal the metallic luster, and then clean it with acetone. The specimen is in a horizontal fixed position with a butt gap of 4 mm. Six points should be spot welded evenly around the circumference by manual TIG welding. The fixed length of each point of the Q235B steel plate shall not be less than 20mm. Electrode model baking temperature and holding time e8018-b2300℃2he309mo-16150℃1.5h3 Welding process parameters According to the calculation formula of preheating temperature, it should be preheated according to scheme 1 before welding: to=350√ [C] -0.25℃; formula , to the preheating temperature, °C.