Effect of process parameters on laser spot welding quality of NdFeB permanent magnet and SPCC steel
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1.
Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
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Corresponding author:
CHANG Bao-hua, bhchang@tsinghua.edu.cn
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Received Date:
2009-03-30
Accepted Date:
2009-04-15
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Abstract
To apply the laser spot welding process in the joining of NdFeB permanent magnet and steel plate cold commercial(SPCC) steel,the effects of laser pulse power,pulse duration,and defocusing distance on weld features and strength were studied experimentally.The resnlts show that there are both conduction welding and keyhole welding in the laser spot welding under our experimental conditions.Welding modes can be transformed by changing peak power or defocusing distance, but not altered by changing pulse duration.There are three fracture modes in shearing tests,i.e.,exuviation,shear and crash fractures,with nugget dimensions and shearing load increasing in tum.To gain good joint strength,the pulse peak power and defocusing distance shonld be chosen appropriately to implement welding in keyhole mode,and moreover,pulse duration should not be too long.
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