Pulsed laser spot welding of intersection points for Zircaloy-4 spacer grid assembly

2013 ◽  
Vol 52 ◽  
pp. 487-494 ◽  
Author(s):  
Wang Tao ◽  
Chuang Cai ◽  
Liqun Li ◽  
Yanbin Chen ◽  
Yi Ling Wang
Keyword(s):  
Spot Welding ◽  
Pulsed Laser ◽  
Laser Spot ◽  
Spacer Grid ◽  
Intersection Points ◽  
Laser Spot Welding

A robust in-process monitoring of pulsed laser spot welding using a point infrared sensor

1998 ◽  
Vol 212 (3) ◽  
pp. 241-250 ◽  
Author(s):  
D-C Lim ◽  
Y-B Cho ◽  
D-G Gweon
Keyword(s):  
Process Monitoring ◽  
Spot Welding ◽  
Pulsed Laser ◽  
Laser Spot ◽  
Weld Quality ◽  
Monitoring Method ◽  
Measuring Condition ◽  
Ir Sensor ◽  
Thin Metal Sheet ◽  
Laser Spot Welding

Many manufactured goods employ pulsed laser spot welding in joining and it is important to monitor the weld quality. The weld quality is highly related to the thermal history of the weld and there have been many trials to monitor the quality using an infrared (IR) sensor. Though the emitted thermal radiation is a function of the emissivity and the surface temperature, the measuring condition has an important influence on the detectable radiation. To increase the reliability of monitoring, it is useful to find the robust feature that is immune to the change of measuring condition. This paper suggests an in-process monitoring method using a point IR sensor for the pulsed laser spot welding of thin metal sheet. The suggested monitoring method is robust to the change of the measuring condition and it can detect the variation of the absorbed energy as well as any serious defect in the weldment.

Temperature Distribution Simulation for Pulsed Laser Spot Welding of Dissimilar Stainless Steel AISI 302 to Low Carbon Steel AISI 1008

2012 ◽  
Vol 445 ◽  
pp. 412-417
Author(s):  
Adel K. Mahmoud ◽  
Ziad A. Taha ◽  
Abeer A. Shehab
Keyword(s):  
Spot Welding ◽  
Peak Power ◽  
Low Carbon Steel ◽  
Pulsed Laser ◽  
Laser Spot ◽  
Low Carbon ◽  
Steel Aisi ◽  
Laser Spot Welding ◽  
Present Simulation ◽  
Stainless Steel Aisi

This paper describes the development of a computer model used to analyze the heat flow during pulsed Nd:YAG laser spot welding of dissimilar metals; stainless steel AISI 302 to low carbon steel AISI 1008. The model is built using ANSYS FLUENT 6.3 software where almost all the environments simulated to be similar to the experimental environments. A simulation analysis was implemented, based on conduction heat transfer, out of the key hole where no melting occurs. The effect of laser power and pulse duration was studied. Four peak powers 5, 5.5, 6.5 and 7 kW were varied during pulsed laser spot welding (keeping the energy constant), also the effect of four pulse durations 5, 6, 6.5 and 7 ms (with constant peak power), on the transient temperature distribution and weld pool dimensions was predicted ,using the present simulation. It was found that the present simulation model can give an indication for choosing the suitable laser parameters (i.e. pulse duration, peak power) during pulsed laser spot welding of dissimilar metals.

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