Prevention of porosity in deep partial penetration laser and hybrid welding with minimum solute oxygen in the weld metal

2010 ◽  
Author(s):  
Susumu Tsukamoto ◽  
Lin Zhao ◽  
Goro Arakane ◽  
Tomohiro Sugino ◽  
Koichi Yasuda
Keyword(s):  
Weld Metal ◽  
Hybrid Welding ◽  
Partial Penetration

scholarly journals Effect of welding condition on microstructures of weld metal and mechanical properties in Plasma-MIG hybrid welding for Al 5083 alloy

2015 ◽  
Vol 33 (1) ◽  
pp. 61-71 ◽  
Author(s):  
Sang-Hyeon Park ◽  
Hee-Keun Lee ◽  
Jin-Young Kim ◽  
Ha-Taek Chung ◽  
Young-Whan Park ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Weld Metal ◽  
Hybrid Welding ◽  
Welding Condition ◽  
Al 5083 Alloy

Corrosion Behaviour of a Laser-MIG hybrid welding-brazing Joint of 6061 Aluminium Alloy to SUS304 Stainless Steel

CORROSION ◽  
10.5006/3866 ◽  
2021 ◽  
Author(s):  
ruilin liu ◽  
Yunqi Liu ◽  
Zheng Lei ◽  
Hui Tang ◽  
Shaoxiong He ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Weld Metal ◽  
Aluminium Alloy ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Salt Spray ◽  
Chemical Properties ◽  
Open Circuit ◽  
Hybrid Welding

Lightweight steel-aluminium structures have broad application prospects because of their lowering weight characteristics, however, the corrosion of welding-brazing joints in steel-aluminium structures is less concerned or studied. In this paper, the corrosion behaviour of the Laser-MIG hybrid welding-brazing joints of steel-aluminium is investigated through the tests and analysis of salt spray, immersion and electrochemistry. The salt spray and immersion tests show that obvious galvanic corrosion occurs at the welded joints, in which the aluminium side is seriously corroded while the steel side is not corroded. The OCP values of the aluminium alloy and the weld metal are similar (approximately -0.48 V), and the stainless steel has a higher OCP value of -0.33 V. The corrosion resistance of the weld metal is lower than aluminium- as well as steel-base materials. The corrosion resistance of the joints is controlled by the aluminium alloy part of the two metals based on the open-circuit potential and EIS analysis. A possible corrosion process schematic for the physical/chemical properties of a welding-brazing joint immersed in a sodium chloride solution is proposed according to electrochemical impedance spectroscopy.

Effect of Welding Method on the Hardness of Joint of 600MPa Grade New Generation Steel

2012 ◽  
Vol 538-541 ◽  
pp. 1526-1531
Author(s):  
Zhi Jun Huang ◽  
Lun Ji Hu ◽  
Tao Pen ◽  
Yu Tao Wang ◽  
Jia He
Keyword(s):  
Weld Metal ◽  
High Efficiency ◽  
Welded Joint ◽  
Fusion Line ◽  
Peak Hardness ◽  
Hybrid Welding ◽  
Softening Effect ◽  
New Generation ◽  
Softened Zone ◽  
Grade Steel

Laser-MAG hybrid, GMAW and SAW welding experiment were carried out for the new low CE 600MPa grade steel, and hardness survey on the welded joints was performed. Laser-MAG hybrid welding has the highest speed with the least filling weld metal, and its joint exhibits almost no softening with higher harness in weld than base metal. SAW welding has high efficiency but most significant softening effect on the HAZ. For SAW, on the HAZ 4 ~ 5 mm apart from the fusion line peak hardness exists. For GMAW, on the HAZ about 2mm away from the fusion line a softened zone appears, but the softening degree is lower than for SAW. The results showed that the hardness of the welded joint of this type of steel seems much subjected to the welding heat input.

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

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940042 ◽  
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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