Effect of severe plastic deformation on hot cracking of wrought aluminium alloy in pulsed laser welding

2013 ◽  
Vol 18 (6) ◽  
pp. 473-477 ◽  
Author(s):  
Z Malekshahi Beiranvand ◽  
F Malek Ghaini ◽  
M Sheikhi ◽  
A Abdollah-Zadeh
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Laser Welding ◽  
Aluminium Alloy ◽  
Pulsed Laser ◽  
Hot Cracking ◽  
Pulsed Laser Welding

The relation between liquation and solidification cracks in pulsed laser welding of 2024 aluminium alloy

2009 ◽  
Vol 519 (1-2) ◽  
pp. 167-171 ◽  
Author(s):  
F. Malek Ghaini ◽  
M. Sheikhi ◽  
M.J. Torkamany ◽  
J. Sabbaghzadeh
Keyword(s):  
Laser Welding ◽  
Aluminium Alloy ◽  
Pulsed Laser ◽  
Pulsed Laser Welding ◽  
Solidification Cracks

Effect of Preheating on Hot Cracking Susceptibility in Pulsed Laser Welding of Invar Alloy

2021 ◽  
pp. 1-9
Author(s):  
DongSheng Zhao ◽  
Liangliang Wu ◽  
TianFei Zhang ◽  
Lele Kong ◽  
YuJun Liu
Keyword(s):  
Laser Welding ◽  
Pulse Duration ◽  
Pulse Wave ◽  
Pulsed Laser ◽  
Fish Bone ◽  
Hot Cracking ◽  
Invar Alloy ◽  
Welding Temperature ◽  
Pulsed Laser Welding ◽  
Measurement Results

Hot cracking is a serious problem in welding of Invar alloy. The weld hot cracking susceptibility of Invar was evaluated using pulsed laser welding on fish-bone sheet experiment. The pulse wave consisted of preheating pulse and welding pulse. Hot cracks that formed along the grain boundary propagated from the weld upper surface to the inside. The experiments show that adding a preheating pulse can effectively reduce the hot cracking susceptibility of Invar alloy. Finite Element Modeling (FEM) calculations and experimental measurement results show that the welding temperature gradient and cooling rate decrease with increasing preheating pulse duration. However, as the preheating pulse duration increases, the hot cracking susceptibility of the Invar alloy does not decrease all the time, but decreases first and then increases. This is because the increase of heat input leads to the increase of shrinkage plastic strain when the preheating pulse duration increases. The maximum tensile strength of the butt welded joint of the Invar alloy was 467.3 MPa, which is 92.3% of the base metal when the preheating pulse duration is 3 ms.

A Study of the Effect of Post-Heating Pulse on Hot Cracking Susceptibility in Pulsed Laser Welding of Invar Alloy

2019 ◽  
Vol 35 (4) ◽  
pp. 338-343 ◽  
Author(s):  
DongSheng Zhao ◽  
ZhenYu Huang ◽  
YuJun Liu ◽  
Tangjun Miao
Keyword(s):  
Laser Welding ◽  
Cooling Rate ◽  
Pulsed Laser ◽  
Welding Process ◽  
Hot Cracking ◽  
Invar Alloy ◽  
Heating Pulse ◽  
Welding Temperature ◽  
Welding Condition ◽  
Pulsed Laser Welding

Hot cracking is one of the major challenges in laser welding of Invar alloy. In this study, welding hot cracking susceptibility experiments are conducted with fish-bone‐type Invar alloy sheets under pulsed laser welding condition. The pulse wave consists of two distinct power levels: welding pulse and post-heating pulse. The welding temperature field can be controlled by changing the duration of the post-heating pulse. The results of experimental measurements and finite element method calculation show that increasing of the post-heating pulse duration leads to a decline in the cooling rate of weld metal within the brittle temperature range, although the welding hot cracking susceptibility decreases at first and then increases. Neither the heat input nor the cooling rate is the only decisive factor for hot cracking during the welding process.

The effect of subsequent laser processing on the properties of welded joints made by pulsed laser welding

2021 ◽  
pp. 1-7
Author(s):  
A. V. Bogdanov ◽  
B. V. Buketkin ◽  
A. A. Kholopov ◽  
A. V. Perestoronin ◽  
R. Galiullin
Keyword(s):  
Laser Welding ◽  
Welded Joints ◽  
Laser Processing ◽  
Pulsed Laser ◽  
Pulsed Laser Welding

Effect of shielding gas on the plasma plume in pulsed laser welding

Measurement ◽  
2019 ◽  
Vol 134 ◽  
pp. 25-32 ◽  
Author(s):  
Jie Xu ◽  
Yi Luo ◽  
Liang Zhu ◽  
Jingtao Han ◽  
Chengyang Zhang ◽  
...  
Keyword(s):  
Laser Welding ◽  
Plasma Plume ◽  
Pulsed Laser ◽  
Shielding Gas ◽  
Pulsed Laser Welding

scholarly journals Effects of Diode Laser Superposition on Pulsed Laser Welding of Aluminum

2013 ◽  
Vol 41 ◽  
pp. 180-189 ◽  
Author(s):  
J.P. Bergmann ◽  
M. Bielenin ◽  
M. Stambke ◽  
T. Feustel ◽  
P. v. Witzendorff ◽  
...  
Keyword(s):  
Laser Welding ◽  
Diode Laser ◽  
Pulsed Laser ◽  
Pulsed Laser Welding
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