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Welder tips presently used in the microweld process are manufactured with a side-by-side lamination geometry which makes susceptible to damage during tip shaping and to short life in production processing.
English (United States)
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Coaxial Microweld Tip
Welder tips presently used in the microweld process are manufactured with a
side-by-side lamination geometry which makes susceptible to damage during tip
shaping and to short life in production processing.
The design of the present microweld tip, as shown in Fig. 1, employs an
epoxy, glass or ceramic laminate 1 to separate the two conductor halves 2
(tungsten or molybdenum) of the tip. This design is extremely fragile, tensile
failure at the dielectric bond often resulting from the forces applied during tip
grinding/ welding processes. Subsequent separation of the tip halves contributes
heavily to the short life of the tip in use.
The disclosed coaxial design tip, which is shown in Fig. 2, overcomes the
previously noted problems by presenting a concentric two element tip with an
inner element 4 and an outer element 5 disposed therearound and bonded by a
360OE bond 3. Fig. 2A shows an embodiment with a flat tip, while Fig. 2B shows
an embodiment with a beveled tip. This design [a 360OE bond 3 between the two
elements of the tip, thereby] substantially reduce the effects of the
grinding/welding forces on the tip. In the disclosed design, tip angles, area of
contact, coaxial diameters and materials all can be optimized to meet weld
process and product requirements.