Mass transport during laser welding of stainless steels and alloys used by US Navy

1994 ◽  
Vol 6 (1) ◽  
pp. 32-37 ◽  
Author(s):  
Anand J. Paul ◽  
Parwaiz A. A. Khan
Keyword(s):  
Mass Transport ◽  
Laser Welding ◽  
Stainless Steels ◽  
Us Navy

scholarly journals Minimization of the Thermal Impact in the Laser Welding of Dissimilar Stainless Steels

Metals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 650 ◽  
Author(s):  
Francisco Cordovilla ◽  
Alejandro Tur ◽  
Ángel García-Beltrán ◽  
Marcos Diaz ◽  
Ignacio Angulo ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Laser Welding ◽  
Stainless Steels ◽  
High Performance ◽  
Chemical Properties ◽  
Laser Pulses ◽  
Passive Layer ◽  
Thermal Impact ◽  
Welding Regime ◽  
Physical And Chemical

Laser welding of dissimilar stainless steels is of interest when mechanical, corrosion, or esthetical requirements impose the use of a high-performance stainless steels, while production-cost requirements prevent using expensive materials in all the parts of a given device. The compromise may lead to the use of the most expensive material in critical areas and the cheapest one in the remaining. Their union can be materialized by laser-pulsed welding. It has intrinsic difficulties derived from the different physical and chemical properties of the steels, and from the need of preserving the protective passive layer. The present work achieves a welded joint with minimum thermal impact by means of laser pulses, capable of preserving the corrosion resistance of the involved stainless steels. The influence of the parameters to define static and dynamic pulses on the material and on the welding regime, keyhole, or heat conduction, is studied. It is used to calculate the overlapping factor of the pulses on the basis of the real dimensions of the melted area. A continuous joint has been built with dynamic pulses. The corrosion resistance of it has been checked showing a similar behavior to the non-heated material. The microstructure of the optimized joint is associated with a reduced HAZ while its mechanical behavior is suitable for its real application.

Real-Time Monitoring of Coaxial Protection Fiber Laser Welding of Austenitic Stainless Steels

2017 ◽  
Vol 44 (5) ◽  
pp. 0502003 ◽  
Author(s):  
任勇 Ren Yong ◽  
武强 Wu Qiang ◽  
邹江林 Zou Jianglin ◽  
陈乐 Chen Le ◽  
肖荣诗 Xiao Rongshi
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
Real Time ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Real Time Monitoring ◽  
Fiber Laser Welding

scholarly journals A New Test Method for Evaluation of Solidification Cracking Susceptibility of Stainless Steel during Laser Welding

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3178 ◽  
Author(s):  
Wenbin Wang ◽  
Li Xiong ◽  
Dan Wang ◽  
Qin Ma ◽  
Yan Hu ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Laser Welding ◽  
Cooling Rate ◽  
Weld Joint ◽  
Stainless Steels ◽  
Welding Speed ◽  
Hot Cracking ◽  
Weld Bead ◽  
Test Method ◽  
Solidification Cracking

A new test method named “Trapezoidal hot” cracking test was developed to evaluate solidification cracking susceptibility of stainless steel during laser welding. The new test method was used to obtain the solidification cracking directly, and the solidification cracking susceptibility could be evaluated by the solidification cracking rate, defined as the ratio of the solidification cracking length to the weld bead length under certain conditions. The results show that with the increase in the solidification cracking rate, the solidification cracking susceptibility of SUS310 stainless steel was much higher than that of SUS316 and SUS304 stainless steels during laser welding (at a welding speed of 1.0 m/min) because a fully austenite structure appeared in the weld joint of the former steel, while the others were ferrite and austenitic mixed structures during solidification. Besides, with an increase in welding speed from 1.0 to 2.0 m/min during laser welding, the solidification cracking susceptibility of SUS310 stainless steel decreased slightly; however, there was a tendency towards an increase in the solidification cracking susceptibility of SUS304 stainless steel due to the decrease in the amount of ferrite under a higher cooling rate.

scholarly journals Nitrogen Absorption by Iron and Stainless Steels during YAG Laser Welding

2000 ◽  
Vol 40 (Suppl) ◽  
pp. S20-S24 ◽  
Author(s):  
Yoshihiro Sato ◽  
Wei Dong ◽  
Hiroyuki Kokawa ◽  
Takeshi Kuwana
Keyword(s):  
Laser Welding ◽  
Stainless Steels ◽  
Nitrogen Absorption ◽  
Yag Laser
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