低合金高强钢Q550D焊接工艺研究  

Research on Welding Technology of Low Alloy High Strength Steel Q550D

作　　者：张凤明[1] 付学义[1] 郎荣彪 Zhang Feng-ming;Fu Xue-yi;Lang Rong-biao(Technical Center of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China)

机构地区：[1]内蒙古包钢钢联股份有限公司技术中心,内蒙古包头014010

出　　处：《包钢科技》2023年第3期49-53,共5页Science & Technology of Baotou Steel

摘　　要：通过采用裂纹敏感指数及预热温度理论计算、斜Y型坡口焊接裂纹敏感性试验及钢板焊接工艺性试验相结合的方法,对比分析不同焊接工艺下接头力学性能及微观金相组织,确定了采用JM-100焊丝及80%Ar+20%CO_(2)的富氩气体,焊接20 mm厚Q550D钢板,裂纹敏感指数为0.28,最低预热温度为13℃,焊接时无需进行预热处理。焊接热输入量控制在9.0~24.8 kJ/cm之间,焊接道次间温度控制在200℃以下,接头各项力学性能指标达到最佳,且焊缝及热影响区均未出现粗大及异常组织。In this paper,the mechanical properties and metallographic structure of the joint with different welding technologies are compared and analyzed with the theoretical calculations of crack sensitivity index and preheating temperature as well as the methods of inclined Y-groove welding crack sensitivity test combining with operative weldability test of steel plate.Moreover,the JM-100 welding wire and 80%Ar+20%CO_(2) argon-rich gas are determined to be adopted for welding the Q550D steel plate with thickness of 20 mm.The crack sensitivity index is 0.28,minimum preheating temperature is 13℃and preheating treatment is not needed during welding.The welding heat input is controlled at 9.0~24.8 kJ/cm,temperature between weld passes is controlled below 200℃,mechanical properties of joint reach the best and there are no coarse and abnormal structures in weld seam and heat affected zone.

关 键 词：Q550D低合金高强钢 焊接工艺 冷裂纹敏感性 接头组织性能 

分 类 号：TG457.11[金属学及工艺—焊接]