1 100 MPa级工程机械用高强度钢的焊接工艺研究  

Study on Welding Technology of 1100 MPa High Strength Steel for Construction Machinery

作　　者：孙文秀 姜海龙 米永峰 董珍 姚晓乐 SUN Wenxiu;JIANG Hailong;MI Yongfeng;DONG Zhen;YAO Xiaole(Steel Tube Co.,Inner Mongolia Baogang Co.,Ltd.,Baotou 014010,China)

机构地区：[1]内蒙古包钢钢管有限公司,内蒙古包头014010

出　　处：《钢管》2023年第5期46-48,共3页Steel Pipe

摘　　要：对1 100 MPa级工程机械用高强度钢进行了斜Y型坡口焊接裂纹试验和焊接热影响区最高硬度试验,研究其焊接工艺。试验表明:该钢种的焊接热影响区存在淬硬倾向,宜选用低氢的焊接材料且焊后进行消氢处理;预热后再焊接时,热影响区的最高硬度有所降低,为防止焊接冷裂纹的产生应进行焊前预热;预热温度高于200℃时,焊缝未出现裂纹,宜采用预热温度高于200℃的焊接工艺。Conducted are the oblique Y shape bevel welding crack test and the HAZ highest hardness test to the 1100 MPa high strength steel for construction machinery purpose so as to study the welding process for it.It is demonstrates via the said tests that there exists a hardening tendency in the HAZ of the steel,therefor low hydrogen-contained welding material should be used,and post-welding dehydrogenation treatment has to be taken;when welding after pre-heating,the HAZ highest hardness decreases to a certain extent,so pre-heating should be done before welding so as to prevent occurrence of the welding cold cracking;since when the pre-heating temperature is more than 200℃,no weld crack develops,the welding process as requiring the pre-heating temperature higher the 200℃should be used.

关 键 词：工程机械用钢 高强度 焊接性能 硬度 

分 类 号：TG457.11[金属学及工艺—焊接]