液压支架结构用Q550低合金高强度钢常温下的焊接
Non-preheating Welding Process for HSLA Q550 Used in Hydraulic Structure
郝永飞1, 陈芙蓉1 , 杨 慧2
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作者单位：（1.内蒙古工业大学 材料学院, 内蒙古 呼和浩特 010051；2.天津工程师范学院 机械工程学院，天津300222）
中文关键字：液压支架； 常温； 低合金高强度钢Q550； 焊接
英文关键字： hydraulic structure; non-preheating; HSLA Q550; welding
中文摘要：对液压支架用Q550低合金高强度钢常温下焊接工艺进行了研究。进行了焊接接头的拉伸、弯曲、低温冲击试验，并对其冲击断口及显微组织进行了观察。结果表明，采用低氢型渣系的低合金高强钢药芯焊丝PK-YJ707A焊接后，焊接接头的屈服强度于母材等强度；冲击吸收功AKV值在-20 ℃时达到107 J，在-40 ℃时达到80 J；焊接接头弯曲后无裂纹或裂纹小于3 mm。力学性能均符合Q550低合金高强度钢的要求。表明合理的焊接工艺、合适的焊接材料可以取消焊前预热。
英文摘要：Non-preheating welding characteristics of low alloy high strength structural steel Q550 was investigated. The tensile, bending and low-temperature impact test of welded joint were carried out. The impact fracture and microstructure of the welded joint were observed. The results show that after using low alloy high strength steel flux-cored welding wire PK-YJ707A of low hydrogen slag type system, the tensile strength of the welded joint equals with the base metal. Impact absorbing energy reaches 107 J at -20℃ and 80 J at -40 ℃; after bending, the welded joint has no crack, or the crack is smaller than 3 mm. The mechanical property meets the requirements of HSLA Q550. The appropriate weld technology and suitable welding material can cancel the preheating process