Microstructure and mechanical properties of 1.4003 ferritic stainless steel welded joints by different welding processes

LU Erjing; ZHANG Yanhui; NIU Xujing; CHEN Liyuan; MIAO Jia

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Microstructure and mechanical properties of 1.4003 ferritic stainless steel welded joints by different welding processes
Vol. 48, Issue 3, Pages: 176-180(2018)
Published：2018
DOI：
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DOI：

LU Erjing, ZHANG Yanhui, NIU Xujing, et al. Microstructure and mechanical properties of 1.4003 ferritic stainless steel welded joints by different welding processes[J]. Eletric Welding Machine2018, 48(3): 176-180. DOI：

摘要

通过拉伸试验、弯曲试验、硬度试验和金相组织分析

研究采用MAG、CMT、PAW、TIG方法焊接的3 mm 1.4003铁素体不锈钢对接接头的常规力学性能和显微组织。结果表明:4种焊接方法下接头的常规力学性能均较为良好;采用奥氏体不锈钢焊丝的MAG、CMT、TIG接头

其焊缝组织均为板条状或网状铁素体和奥氏体

接头硬度较高。PAW不填加焊丝的焊缝组织为与母材同质的块状铁素体

其焊缝硬度不及母材。铁素体晶粒的粗化对接头的强度和硬度有不利影响。

Abstract

Through the tensile testing

bend testing

hardness testing and analysis of the microstructure

this paper studied the conventional mechanical properties and the microstructure of 3 mm ferritic stainless steel welded joints by MAG

CMT

PAW and TIG. The results show that:The conventional mechanical properties of the joints by all these four welding processes are accepted. The austenitic stainless steel welding wires were applied to the MAG

CMT and TIG joints. The microstructure of weld is the lath ferrite or reticulum ferrite in the austenitic matrix

and these joints have higher hardness. The microstructure of autogenous PAW weld is bulk ferrite with homogeneity of the parent material

and its hardness is less than that of the parent material. The coarsening of ferrite grain has an adverse effect on the strength and hardness of the joint.