Identifying Operating Conditions from Pre-weld Information
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Resistance spot welding is one of the dominant sheet metal joining processes in the automobile, aerospace and appliance industries. This process has been around since the turn of the century, but the factors affecting process quality are not well understood. The data presented in this paper shows that set-up conditions such as electrode condition, electrode alignment and part fitup are critical for selection of the appropriate weld schedule. The data further show that these conditions are reflected in the nature of the force and displacement signals that are measured when the electrodes are brought in contact with the work pieces. Several algorithms are discussed that can identify the presence or absence of 4 set-up faults, 1. Angular misalignment 2. Fitup Faults.
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