基于不同焊材的超高强钢与BS700高强钢焊接接头裂纹的试验研究
Experimental Study on Cracks in Welding Joints of Ultra-high Strength Steel and BS700 High Strength Steel with Different Welding Materials
王德军 1王彤2
作者信息
- 1. 山河智能特种装备有限公司 技术中心,湖南 长沙 410100;湖南省岩土施工装备与控制工程技术研究中心,湖南 长沙 410100
- 2. 湖南省岩土施工装备与控制工程技术研究中心,湖南 长沙 410100;湖南福力科技有限公司 技术部,湖南 长沙 410100
- 折叠
摘要
采用熔化极活性气体保护焊对抗拉强度大于 1 600 MPa的超高强钢与抗拉强度大于 760 MPa的BS700 高强钢进行焊接时,组合接头焊缝易出现焊接裂纹,为解决该问题,使用直径1.0 mm的ER70-G焊材或ER307Mo焊材,在打底焊接电流160～180 A、电压 21～24 V,盖面焊接电流 190～210 A、电压 23～26 V条件下开展了焊接对比试验.工艺性和焊接性试验结果表明,使用ER307Mo焊材焊接的试样弯曲性能明显优于使用ER70-G焊材焊接的试样;使用ER70-G焊材焊接的试样焊缝存在未贯穿的微裂纹,焊缝断面裂纹率达到35.29%;使用ER307Mo焊材焊接的试样焊缝断面未发现裂纹.ER307Mo焊材更适合超高强钢与BS700 高强钢的焊接.试验解决了超高强钢与BS700高强钢组合接头的开裂问题,为抗拉强度相差较大的异种高强钢的焊接提供了解决方案.
Abstract
When ultra-high strength steel with tensile strength more than 1600 MPa and BS700 high-strength steel with tensile strength more than 760 MPa are joined together by metal active gas welding,weld cracks are prone to occur in the seam of joint.To solve this problem,comparative welding tests were performed by using ER70-G or ER307Mo welding wire with diameter of 1.0 mm,respectively,with initial welding current of 160-180 A,voltage of 21-24 V,and final welding current of 190-210 A,voltage of 23-26 V.The comparison of process and weldability show that welding with ER307Mo can lead to the sample with bending property obviously better than that by welding with ER70-G.The sample after welding with ER70-G can be found to have micro-cracks not going through the whole cross section of welding seam,with cracking rate on the cross section of seam reaching 35.29%,but no cracks are found on the section of welding seam by using ER307Mo.It is concluded that the ER307Mo welding wire is more suitable for welding ultra-high strength steel and BS700 high strength steel.The study has solved the cracking problem in the joint of ultra-high strength steel and BS700 high strength steel,which can provide a solution for the welding of dissimilar high-strength steel with larger difference in tensile strength.
关键词
焊接/超高强钢/高强钢/焊接接头/裂纹/焊材/刚性拘束/熔化极活性气体保护焊/异种钢焊接/轻量化Key words
welding/ultra-high strength steel/high strength steel/welding joint/crack/welding materials/rigid constraint/metal active gas(MAG)welding/dissimilar steel welding/lightweight引用本文复制引用
出版年
2024
NETL
NSTL
万方数据