Microstructure and mechanical properties of HSLA thick plates welded by novel double-sided gasmetal arc welding
Microstructure and mechanical properties of HSLA thick plates welded by novel double-sided gasmetal arc welding
复制标题
新型双面熔化极气体保护焊HSLA厚板的显微组织与力学性能
DOI：
10.1007/s00170-014-6477-0
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Shanben Chen
中科院分区：
文献类型：
--
作者：
Yuxi Chen;Chengdong Yang;Huabin Chen;Huajun Zhang;Shanben Chen
本文提出了一种新型的50mm厚低合金高强钢双面气体金属电弧焊工艺。可获得无明显缺陷的良好焊接接头。对其微观组织和力学性能进行了详细的研究。结果表明：基体金相组织主要由回火板条马氏体和少量粒状贝氏体组成；熔合区主要由针状铁素体和板条马氏体组成，焊头组织由针状铁素体和少量粒状贝氏体组成。焊头的平均硬度值（384.9 HV）高于母材（282.2 HV），但低于热影响区。焊接试样的平均抗拉强度（862.73 MPa）达到母材（880 MPa）的98.04%。试样经180°弯曲后不产生裂纹，焊接接头塑性性能均较好。FL + 2mm和FL + 5mm的冲击吸收能高于WC和FL， WC和FL的断裂模式为解理断裂，FL + 2mm和FL + 5mm的断裂模式为韧性断裂。因此，双面GMAW焊接是一种高效的无背屑焊接方法，在厚板焊接中具有一定的优势和可能性。
In this paper, a novel double-sided gas metal arc welding procedure was developed to weld 50 mm thick, low-alloy high-tensile steel. The good weld joint without visible flaws can be obtained. The microstructure and mechanical properties were investigated in detail. The results show that the base metal metallographic microstructure mainly consists of tempering lath martensite and a small amount of granular bainite. The fusion zone is mainly composed of acicular ferrite and lath martensite while the microstructure of the welded bead is composed of acicular ferrite and a small amount of granular bainite. The average hardness value of the welded bead (384.9 HV) is higher than the base metal (282.2 HV), but lower than the heat-affected zone. The average tensile strength of the welded specimens (862.73 MPa) reaches 98.04 % of the base metal (880 MPa). No crack produced when the samples have been bended to 180° and the welding joints all have better plastic property. The impact absorbing energies in FL + 2 mm and FL + 5 mm are higher than those in WC and FL. The fracture modes of WC and FL are cleavage fracture and those of FL + 2 mm and FL + 5 mm are ductile fracture. Consequently, the double-sided GMAW is a high-efficiency welding method without back chipping which has certain advantages and possibility in welding thick plates.