Porosity and joint property of laser-MIG hybrid welding joints for 304 stainless steel

Stainless steel is a family of Fe-based alloys having excellent resistance to corrosion and as such has been used imperatively for kitchen utensils, transportation, building constructions and much more. This paper presents the work conducted on the material characterizations of a tungsten inert gas (TIG)–metal inert gas (MIG) hybrid welded joint of type 304 austenitic stainless steel. The welding processes were conducted in three phases. The phases of welding employed are MIG welding using a current of 170[Formula: see text]A, TIG welding using a current of 190[Formula: see text]A, and a hybrid TIG–MIG welding with currents of 190/170[Formula: see text]A, respectively. The MIG, TIG, and hybrid TIG–MIG weldments were characterized with incomplete penetration, full penetration and excess penetration of weld. Intergranular austenite was created toward transition and heat affected zones. The thickness of the delta ferrite ([Formula: see text]-Fe) formed in the microstructures of the TIG weld is more than the thickness emerged in the microstructures of MIG and hybrid TIG–MIG welds. A TIG–MIG hybrid weld of specimen welded at the currents of 190/170[Formula: see text]A has the highest ultimate tensile strength value and percentage elongation of 397.72[Formula: see text]MPa and 35.7%. The TIG–MIG hybrid welding can be recommended for high-tech industrial applications such as nuclear, aircraft, food processing, and automobile industry.

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The Regulation of Laser-Arc Hybrid Welding Source on TC4 Ti Alloy to 304 Stainless Steel Joints with Interlayers

Transactions on Intelligent Welding Manufacturing ◽

10.1007/978-981-13-3651-5_8 ◽

2019 ◽

pp. 109-120 ◽

Cited By ~ 1

Author(s):

Hongyang Wang ◽

Gang Song ◽

Zhonglin Hou ◽

Liming Liu

Keyword(s):

Stainless Steel ◽

304 Stainless Steel ◽

Ti Alloy ◽

Hybrid Welding ◽

Steel Joints

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Intermediate layer, microstructure and mechanical properties of aluminum alloy/stainless steel butt joint using laser–MIG hybrid welding–brazing method

International Journal of Modern Physics B ◽

10.1142/s0217979217440350 ◽

2017 ◽

Vol 31 (16-19) ◽

pp. 1744035 ◽

Cited By ~ 3

Author(s):

Zongtao Zhu ◽

Zhandong Wan ◽

Yuanxing Li ◽

Junyu Xue ◽

Chen Hui

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Stainless Steel ◽

Intermediate Layer ◽

Mg Alloy ◽

304 Stainless Steel ◽

Double Layers ◽

Al Alloy ◽

Hybrid Welding ◽

Total Thickness

Butt joining of AA6061 aluminum (Al) alloy and 304 stainless steel of 2-mm thickness was conducted using laser–MIG hybrid welding–brazing method with ER4043 filler metal. To promote the mechanical properties of the welding–brazing joints, two kinds of intermediate layers (Al–Si–Mg alloy and Ag-based alloy) are used to adjust the microstructures of the joints. The brazing interface and the tensile strength of the joints were characterized. The results showed that the brazing interface between Al alloy and stainless steel consisted of double layers of Fe2Al5 (near stainless steel) and Fe4Al[Formula: see text] intermetallic compounds (IMCs) with a total thickness of 3.7 [Formula: see text]m, when using Al–Si–Mg alloy as the intermediate layer. The brazing interface of the joints using Ag-based alloy as intermediate layer also consists of double IMC layers, but the first layer near stainless steel was FeAl2 and the total thickness of these two IMC layers decreased to 3.1 [Formula: see text]m. The tensile strength of the joints using Al–Si–Mg alloy as the intermediate layer was promoted to 149 MPa, which was 63 MPa higher than that of the joints using Al–Si–Mg alloy as the intermediate layer. The fractures occurred in the brazing interface between Al alloy and stainless steel.

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Influence of Laser-Arc Distance on Joint of 304 Stainless Steel by Laser-MIG Hybrid Welding

Laser & Optoelectronics Progress ◽

10.3788/lop55.061407 ◽

2018 ◽

Vol 55 (6) ◽

pp. 061407

Author(s):

韩丽梅 Han Limei ◽

蔡得涛 Cai Detao ◽

张宇鹏 Zhang Yupeng ◽

张楠楠 Zhang Nannan

Keyword(s):

Stainless Steel ◽

304 Stainless Steel ◽

Hybrid Welding ◽

Arc Distance

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HISCC behavior of SUS301L-MT stainless steel laser-arc hybrid welding joints

International Journal of Modern Physics B ◽

10.1142/s0217979219400423 ◽

2019 ◽

Vol 33 (01n03) ◽

pp. 1940042 ◽

Cited By ~ 1

Author(s):

Z. H. Fu ◽

T. Li ◽

M. L. Mei ◽

G. Q. Gou ◽

Z. Y. Zhu ◽

...

Keyword(s):

Stainless Steel ◽

Weld Metal ◽

Strain Rate ◽

Stress Corrosion Cracking ◽

Index Formula ◽

Hybrid Welding ◽

Nacl Solution ◽

Induced Stress ◽

Secondary Cracks ◽

Welding Joints

The hydrogen-induced stress corrosion cracking (HISCC) behavior of SUS301L-MT stainless steel laser-arc hybrid welding (LAHW) joints was investigated using slow strain rate tensile (SSRT) method in 3.5 wt.% NaCl solution under different cathodic potentials. With the negative shift of applied potentials from open circle potential (OCP) to −1400 mV[Formula: see text], the HISCC susceptibility index ([Formula: see text]) decreased from 0.15 (OCP) to 0.06 (−400 mV[Formula: see text]), then increased to 0.28 (−1400 mV[Formula: see text]). The specimens tested in air and under OCP to −800 mV ruptured in weld metal zone with ductile features of dimples. While with the potential turned more negative, the specimens ruptured in base metal zone with brittle features of transgranular cleave in martensite, intergranular failure and secondary cracks [Chen et al., Int. J. Adv. Manuf. Technol. 73, 1695 (2014)].

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