1700 MPa级超高强防护钢焊接工艺研究

Study on the Welding Process of 1700 MPa Grade Ultra-high Strength Protective Steel

为保证装甲防护钢板焊接接头性能满足产品结构设计需求,采用熔化极气体(MAG)保护焊、激光-MAG复合焊和激光填丝焊三种焊接工艺,对1700 MPa级国产新型装甲钢板30MnMoTiB(4.5 mm)进行焊接摸底验证,焊丝采用830 MPa级低合金钢焊丝ER83-G。试验结果表明,MAG焊因热输入较大,故焊接试板变形大,且焊缝母材熔合比较低,接头强度仅可达到母材抗拉强度标准值的64.6%;而激光-MAG复合焊接和激光填丝焊的焊接试板几乎无变形,焊缝母材熔合比高,接头强度可分别达到母材抗拉强度标准值的81.2%、93.6%,焊接强度、焊接效率在MAG焊的基础上得到大幅提升。

In order to ensure that the performance of welded joint of armor steel meets the requirements of product structure design,the welding experiments of 30MnMoTiB(4.5 mm),a new type of armor steel of 1700 MPa grade,are carried out by three kinds of welding processes:metal active gas(MAG)arc welding,laser-MAG hybrid welding and laser wire filling welding,830 MPa grade low-alloy steel welding wire of ER83-G is adopted.The test results indicate that the MAG welding undergoes significant deformation,moreover,the fusion of the weld base metal is relatively low,and the joint strength can only reach 64%of the standard tensile strength value of the base metal;laser-MAG hybrid welding and laser wire filling welding has almost no deformation,and the fusion ratio of the weld base metal is high.The joint strength can reach 81%and 93%of the standard tensile strength value of the base material,the welding strength and efficiency have been significantly improved on the basis of MAG welding.