Stress relief and edge sealing of welded joints in plastics part

Details Stress relief and edge sealing of welded joints in plastics part Stress relief and edge sealing of welded joints in plastics part

1984-05-11

1987-05-05

Silbaugh, Jan

Stock material or miscellaneous articles

Sheets or webs edge spliced or joined

156 69, 156 735, 156267, 1563046, 156580, 264 23, 264 68, 264161, 264163, 264248, B32B 300, B29C 3704

Patent

active

046632069

ABSTRACT:
In order to stress relieve exposed portions of plastic welds, and thereby reduce susceptability of such welds to solvent-induced crazing and cracking, the welded parts are formed with flanges extending outwardly therefrom. These flanges are at least partially joined during welding, their adjoining surfaces providing at least a portion of the welded joint. After welding, the flanges are compressed in a direction transverse to their adjoining welded surfaces, the compression being of sufficient magnitude to exceed the yield strength of the flanges, thereby relieving stresses in the exposed portion of the welds. The flanges may be sheared, as by a blade which provides both transverse compressive forces and compressive forces in the direction of the adjoining welded surfaces. The flanges may be sheared through, so as to enable the sheared off end to be removed, or the shearing may penetrate only through the weld zone, providing a notch, but leaving the flanges in place. The compressed and/or sheared flanges provide an exposed portion of the welds in which tensile stresses are relieved, reducing susceptability to solvent-induced crazing or cracking, and thereby edge sealing the welds.

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patent: 4328067 (1982-05-01), Cesano
patent: 4337024 (1982-06-01), Turner et al.
patent: 4390384 (1983-06-01), Turner

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