Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With cutting – punching – piercing – severing – or tearing
Patent
1986-04-21
1988-01-12
Hoag, Willard E.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With cutting, punching, piercing, severing, or tearing
72 71, 72328, 72412, 83658, 83851, 83886, 83887, 1565801, 228 13, 228 443, 4251742, 425289, 425383, B29C 6508, B29C 6574
Patent
active
047189703
ABSTRACT:
In order to stress relieve exposed portions of plastic welds, and thereby reduce susceptibility 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 susceptibility to solvent-induced crazing or cracking, and thereby edge sealing the welds.
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Bouyoucos John V.
Durfee David W.
Hoag Willard E.
Hydroacoustics
Lukacher Martin
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