Method and apparatus for treating plastic welds to relieve stres

Details Method and apparatus for treating plastic welds to relieve stres Method and apparatus for treating plastic welds to relieve stres

1984-05-11

1986-07-22

Wityshyn, Michael

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156154, 156267, 1563046, 1563096, 1563099, 156312, 156499, 156580, 264 68, 264161, 264248, 425456, 425460, 425806R, B29C 6506, B29C 6518

Patent

active

046017682

ABSTRACT:
To relieve stresses in a plastic weld which may weaken the weld and increase its susceptibility to solvent-induced crazing or cracking, forces are applied to the weld zone (the interface between welded parts) after it has cooled to solid condition, but preferably when it is at a higher temperature than the regions of the parts adjacent thereto, which forces are higher than the yield strength of the material at the weld zone and lower than the yield strength of the material in the regions of the parts adjacent to the weld zone. The forces thereby cause yielding or plastic deformation which effectively relieves certain thermally induced stresses in the weld. Tensile stresses in the weld are thereby relieved, to reduce susceptibility of the weld to solvent-induced crazing or cracking.

REFERENCES:
patent: 3501110 (1970-03-01), Hopgood et al.
patent: 3605253 (1971-09-01), Calton et al.
patent: 3618196 (1971-11-01), Sluetz
patent: 4337024 (1982-06-01), Turner et al.
patent: 4377428 (1983-03-01), Toth
patent: 4390384 (1983-06-01), Turner

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