scholarly journals Suppression of Bottom Porosity in Fiber Laser Butt Welding of Stainless Steel

Photonics ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 359
Author(s):  
Xiaobing Pang ◽  
Jiahui Dai ◽  
Mingjun Zhang ◽  
Yan Zhang
Keyword(s):  
Stainless Steel ◽  
Laser Welding ◽  
Ultrasonic Vibration ◽  
Vehicle Body ◽  
Shielding Gas ◽  
Rear Wall ◽  
Butt Welding ◽  
Welding Technology ◽  
High Prevalence ◽  
Weld Porosity

The application bottleneck of laser welding is being gradually highlighted due to a high prevalence of porosity. Although laser welding technology has been well applied in fields such as vehicle body manufacturing, the suppression of weld porosity in the laser welding of stainless steel containers in the pharmaceutical industry is still challenging. The suppression of bottom porosity was investigated by applying ultrasonic vibration, changing welding positions and optimizing shielding gas in this paper. The results indicate that bottom porosities can be suppressed through application of ultrasonic vibration at an appropriate power. The keyhole in ultrasound-assisted laser welding is easier to penetrate, with better stability. No obvious bulge at the keyhole rear wall is found in vertical down welding, and the keyhole is much more stable than that in flat welding, thus eliminating bottom porosity. The top and bottom shielding gases achieve the minimal total porosities, without bottom porosity.

Effect of Shielding Gas on Laser Welding of Austenitic Stainless Steel

2014 ◽  
Vol 51 (5) ◽  
pp. 051402
Author(s):  
刘键 Liu Jian ◽  
石岩 Shi Yan ◽  
刘佳 Liu Jia ◽  
张宏 Zhang Hong
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Laser Welding ◽  
Shielding Gas

The Influence of the Shielding Gas to the Static and Dynamic Strength Properties of Laser Welded Workhardened Nitrogen Alloyed Austenitic Stainless Steel

2013 ◽  
Vol 549 ◽  
pp. 471-476 ◽  
Author(s):  
Markku Keskitalo ◽  
Kari Mäntyjärvi
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Laser Welding ◽  
Energy Input ◽  
Low Cycle Fatigue ◽  
Dynamic Strength ◽  
Strength Properties ◽  
Shielding Gas ◽  
Melted Zone ◽  
Welded Structure

As an interstitial atom, nitrogen strengthens the structure of austenitic stainless steel (ASS). It therefore has been used to increase the strength of ASS. On the other hand, work hardening of ASS is a common method to increase the strength of the sheet product. When a work-hardened structure is welded, the strength properties decreases at the melted zone and the heat-affected zone (HAZ) of the weld. The nitrogen content can also be reduced by the effect of the heat input of the weld. Because the width of the soft area of the HAZ depends on the energy input of the weld, the strength of the weld depends on energy input. Therefore, laser welding provides better strength to the welded structure. The role of the shielding gas is also significant. Argon shielding gas is inert, but nitrogen used as a shielding gas can strengthen the weld metal and HAZ microstructure. In this study, the effect of different shielding gases in the laser welding of AISI 201 LN TR type work-hardened ASS are tested and the results are reported. Both non-destructive material and destructive material tests are performed. According to the results of the tensile test, the use of nitrogen as a shielding gas strengthens the laser-welded structure. The results of the low-cycle fatigue test show that fatigue strength improves when nitrogen is used as the shielding gas.

Application of lap laser welding technology on stainless steel railway vehicles

2016 ◽  
Author(s):  
Hongxiao Wang ◽  
Chunsheng Wang ◽  
Guangzhong He ◽  
Wei Li ◽  
Liguo Liu
Keyword(s):  
Stainless Steel ◽  
Laser Welding ◽  
Railway Vehicles ◽  
Welding Technology

scholarly journals Development of Laser Welding Technology for Fully Austenitic Stainless Steel

2015 ◽  
Vol 33 (2) ◽  
pp. 126-132
Author(s):  
Katsutoshi TAKANO ◽  
Norikiyo KOIZUMI ◽  
Hisashi SERIZAWA ◽  
Shuho TSUBOTA ◽  
Yoshinobu MAKINO
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Laser Welding ◽  
Welding Technology

Ultrasonic vibration assisted laser welding of nickel-based alloy and Austenite stainless steel

2018 ◽  
Vol 31 ◽  
pp. 759-767 ◽  
Author(s):  
Siyu Zhou ◽  
Guangyi Ma ◽  
Wu Dongjiang ◽  
Dongsheng Chai ◽  
Mingkai Lei
Keyword(s):  
Stainless Steel ◽  
Laser Welding ◽  
Ultrasonic Vibration ◽  
Austenite Stainless Steel ◽  
Nickel Based Alloy

Development of laser welding technology for fully austenitic stainless steel

2017 ◽  
Vol 31 (11) ◽  
pp. 827-836
Author(s):  
Katsutoshi Takano ◽  
Norikiyo Koizumi ◽  
Hisashi Serizawa ◽  
Shuho Tsubota ◽  
Yoshinobu Makino
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Laser Welding ◽  
Welding Technology

Parametric Study of Underwater Laser Welding on 304 Austenite Stainless Steel

2019 ◽  
Vol 972 ◽  
pp. 222-228
Author(s):  
Yun Long Fu ◽  
Ning Guo ◽  
Ji Cai Feng
Keyword(s):  
Stainless Steel ◽  
Laser Welding ◽  
Welding Speed ◽  
Laser Power ◽  
Single Layer ◽  
Working Environment ◽  
Laser Weld ◽  
Butt Welding ◽  
Austenite Stainless Steel ◽  
Underwater Laser

The underwater laser welding assisted by a single-layer gas torch was carried out on the austenite stainless steel based on the underwater laser welding experimental platform. Butt welding experiments under shallow water were performed to investigate the effects of laser power, welding speed and defocusing distance on the underwater laser welding quality and optimized the process parameters. It was found that the ideal underwater laser weld can be obtained with the laser power of 2.0 kW, the welding speed of 2.0 m/min and the defocusing distance of 1 mm, demonstrating the self-developed single-layer gas-assisted drainage device could create working environment similar to onshore laser welding, by analyzing the metallographic structure and mechanical properties of underwater laser weld and in-air laser weld.

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