Resistance welding apparatus

Details Resistance welding apparatus Resistance welding apparatus

1990-01-16

1991-06-04

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219 81, B23K 1125

Patent

active

050216260

ABSTRACT:
Apparatus for welding longitudinal seams in can bodies includes upper and lower electrode wheels mounted on arms, a transducer for detecting vertical displacement of the upper wheel, a pair of pick-ups for detecting the rotational positions of the wheels, and a single processing circuit. The transducer output is divided into a set of traces, each corresponding to a single wheel rotation. The traces are averaged to produce a representation of the wheel profile. Each wheel profile is subtracted from the transducer output to produce a good indication of weld thickness. Alternatively, the transducer output is divided into a series of traces, each of which represents the vertical displacement of the upper wheel while welding a single can body. These are averaged to provide a good indication of weld thickness. The wheels have surface irregularities and each is inevitably mounted with some degree of eccentricity. Unwanted transducer output components due to these irregularities and eccentricities are removed.

REFERENCES:
patent: 2818491 (1957-12-01), Matulaitis
patent: 4376883 (1983-03-01), Dao et al.
patent: 4788405 (1988-11-01), Haigh et al.

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