Multipass induction heating for thermoplastic welding
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United States of America Patent
Stats
-
Jan 23, 1996
Grant Date -
N/A
app pub date -
Jan 3, 1995
filing date -
Jan 3, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An induction coil is passed over an interface between two resinous parts to be welded and an alternating magnetic field generated by the coil induces eddy currents in a foraminous susceptor positioned in the interface between the two parts. Pressure is applied to squeeze the two parts together while the induction heating of the susceptor raises the temperature of the resin in the faying surfaces of the two parts to the softening temperature so that resin flows through the interstices in the susceptor and bonds the two parts together. The induction heating and pressure application passes are repeated four or more times, increasing the power to the induction coil in the later passes to increase the heat input. The strength and continuity of the weld improves with each pass, although the incremental improvement diminishes after about four passes.
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