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针对等离子焊接直缝不锈钢管出现的咬边、气孔等焊缝表面成形缺陷,提出等离子+TIG双枪焊接新工艺,并对焊接接头进行X射线探伤检测、显微组织分析及力学性能测试。试验结果表明:等离子+TIG双枪焊接中,双枪具有协同效应。TIG电弧对前一焊道进行了重熔,有效抑制了等离子焊接缺陷的产生;直缝不锈钢管各项性能满足生产要求。准114 mm×3.0 mm的AISI304不锈钢在获得良好焊缝成形的条件下,采用等离子+TIG双枪焊接工艺的焊接速度可以达到360 mm/min;与等离子焊接工艺相比,生产效率大大提高,基本实现焊缝零缺陷。
Aiming at the defect of surface forming of undercuts, pores and other weld appeared in plasma welded straight seam stainless steel tube, a new technology of plasma + TIG double gun welding was put forward. X-ray flaw detection, microstructure analysis and mechanical property test of welded joint were carried out. The experimental results show that the two guns have a synergistic effect in the plasma + TIG two-gun welding. The TIG arc remelted the previous bead, which effectively restrained the occurrence of plasma welding defects. The performance of straight seam stainless steel pipe met the production requirements. Standard AISI 304 stainless steel with the standard size of 114 mm × 3.0 mm can achieve a welding speed of 360 mm / min with the plasma + TIG twin-gun welding process under the condition of good weld formation. Compared with the plasma welding process, the production efficiency is greatly improved. The basic Zero weld defects.