Q355B钢与Q345B钢MAG焊焊接接头力学性能对比研究  

Comparative study on mechanical properties of Q355B steel and Q345B steel MAG welded joints

作　　者：赵小康 张海燕 屈海东 廖国锋 李慧琼 ZHAO Xiaokang;ZHANG Haiyan;QU Haidong;LIAO Guofeng;LI Huiqiong(Gansu Steel Vocational and Technical College,Jiuquan 735100,Gansu,China;Guangxi LiuGong Machinery Co.,Ltd.,Liuzhou 545001,Guangxi,China)

机构地区：[1]甘肃钢铁职业技术学院,甘肃酒泉735100 [2]广西柳工机械股份有限公司,广西柳州545001

出　　处：《金属加工（热加工）》2024年第12期30-33,共4页MW Metal Forming

基　　金：甘肃省高校教师创新基金项目(2023B-488)。

摘　　要：利用MAG焊,选用合适的焊接参数对其LGQ355B钢与LGQ345B钢进行焊接工艺试验,对比两种钢材在相同焊接条件下焊接接头的力学性能。结果表明:二者母材相比较,LGQ355B钢比LGQ345B钢具有较高的抗拉强度、屈服强度,平均高出30MPa,而LGQ345B钢具有较好的塑性和冲击韧性,并且二者母材纵向冲击性能明显要优于横向冲击性能。二者焊接接头相比较,其接头力学性能均满足标准要求,主要与母材本身及所选用焊丝的特性有关系,由于LGQ345B钢本身强度比LGQ355B钢低,其焊接接头表现出高强匹配,并且焊缝中心冲击韧性优于LGQ355B钢,因此二者钢材整体焊接接头焊缝中心冲击韧性要优于母材。通过研究,在日常结构件的制造过程中采用新标准下的Q355B钢与旧标准下的Q345B钢相比较,二者焊接工艺、焊接接头性能差异不是十分明显,焊接过程无需区别对待,可进行正常替代,同时为新标准下Q355B钢的焊接提供理论指导。Using MAG welding,select appropriate welding process parameters to conduct welding process tests on LGQ355B steel and LGQ345B steels,and compare the mechanical properties of the welded joints of the two steels under the same welding conditions.The results indicate that:Compared with LGQ345B steel,LGQ355B steel has higher tensile strength and yield strength,with an average increase of 30MPa,while LGQ345B steel has better plasticity and impact toughness,and the longitudinal impact performance of the two base materials is significantly better than the transverse impact performance.The mechanical properties of the two types of steel welded joints meet the standard requirements,mainly related to the characteristics of the base material itself and the selected welding wire.Due to the lower strength of the LGQ345B steel base material compared to LGQ355B steel,its welded joints exhibit high-strength matching,and the center impact toughness of the weld seam is better than that of LGQ355B steel.The overall impact toughness of the weld seam center of the two types of steel welded joints is better than that of the base material.Through research,it has been found that in the manufacturing process of daily structural components,the difference in welding process and joint performance between Q355B steel under the new standard and Q345B steel under the old standard is not very significant.The welding process does not need to be treated differently and can be replaced normally.At the same time,it provides theoretical guidance for the welding of Q355B steel under the new standard.

关 键 词：MAG焊 Q355B钢 Q345B钢 焊接工艺试验 力学性能 

分 类 号：TG407[金属学及工艺—焊接]