アクティブ赤外線サーモグラフィ法による車体接着範囲の非破壊評価

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  • Nondestructive evaluation for adhesion region of automotive body with active infrared thermography.

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<p>In recent years, the solution for challenge that car body weight reduction compatible with rigidity improvement is required. Weld bonding is one of the methods to solve the problem. This method is based on a combination of bonding at the car body and spot welding, and this makes it possible to improve rigidity of the body structure even if the thickness of steel plate is reduced. For applying weld bond method, inspection of the adhesion region is important. Therefore, developing a new nondestructive testing technique which enables in-line inspection for all car bodies is required. In this research, we examined the applicability of the active pulse heating infrared thermography for the inspection of adhesion region. We tested two kinds of specimen in this research. One is a hat type specimen which was simulated car body frame parts, the other is a plate specimen for examining the effect of thickness of steel sheet on the accuracy of adhesion region identification. Further for simulating the actual in-line production process, applicability of the active infrared thermography was tested for plate specimen heated to high temperature. Experimental results show the applicability of the proposed technique for the in-line nondestructive testing for car body frame parts under production process.</p>

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