In Situ Observation of Solidification Conditions in Pulsed Laser Welding of AL6082 Aluminum Alloys to Evaluate Their Impact on Hot Cracking Susceptibility

2015 ◽  
Vol 46 (4) ◽  
pp. 1678-1688 ◽  
Author(s):  
Philipp von Witzendorff ◽  
Stefan Kaierle ◽  
Oliver Suttmann ◽  
Ludger Overmeyer
Keyword(s):  
Aluminum Alloys ◽  
Laser Welding ◽  
Pulsed Laser ◽  
Hot Cracking ◽  
In Situ Observation ◽  
Pulsed Laser Welding

Magnesium Loss in Nd:YAG Pulsed Laser Welding of Aluminum Alloys

2018 ◽  
Vol 49 (5) ◽  
pp. 2896-2905 ◽  
Author(s):  
Z. Malekshahi Beiranvand ◽  
F. Malek Ghaini ◽  
H. Naffakh-moosavy ◽  
M. Sheikhi ◽  
M. J. Torkamany
Keyword(s):  
Aluminum Alloys ◽  
Laser Welding ◽  
Pulsed Laser ◽  
Pulsed Laser Welding ◽  
Magnesium Loss

The relation between magnesium evaporation and laser absorption and weld penetration in pulsed laser welding of aluminum alloys: Experimental and numerical investigations

2020 ◽  
Vol 128 ◽  
pp. 106170 ◽  
Author(s):  
Zeinab Malekshahi Beiranvand ◽  
Farshid Malek Ghaini ◽  
Homam Naffakh Moosavy ◽  
Mohsen Sheikhi ◽  
Mohammad Javad Torkamany ◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Laser Welding ◽  
Pulsed Laser ◽  
Weld Penetration ◽  
Pulsed Laser Welding ◽  
Numerical Investigations ◽  
Laser Absorption

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
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