SOUND SENSING OF THE KEYHOLE BEHAVIORS IN PLASMA ARC WELDING

Abstract

Abstract: The characteristics of the sound emitted from plasma arc welding of stainless steel is investigated. It is found that the sound pressure at the non-keyhole stage is lower than that at the keyhole stage. In transition case, the weld pool, changing its state from non-keyhole to keyhole or vice versa, vibrates considerably with lower frequency. The spectrum analysis of the sound signal show as that less than 100 Hz part of the sound is large on the transition stage, small on the keyhole stage and medium on the non-keyhole stage. According to this information, a sensing technique is proposed to judge the keyhole status in plasma arc welding. It may be used in the detection of plasma arc welding penetration to control the welding quality.

Key words: Keyhole, Plasma arc welding, Sensing, Sound signal

CLC Number:

TG456.2

Wang Yaowen;Chen Qiang;Sun Zhenguo;Sun Jiuwen;Wang Haiyan. SOUND SENSING OF THE KEYHOLE BEHAVIORS IN PLASMA ARC WELDING[J]. , 2001, 37(1): 53-56.

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SOUND SENSING OF THE KEYHOLE BEHAVIORS IN PLASMA ARC WELDING

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