Catheter guide wire welding of SUS wire to a Ni alloy using resistance welding can result in the weld being brittle and of low structural integrity. One way of mitigating these 2 potential issues is to use closed loop feedback and the multi-step function in the welding parameters.
The NRW-IN400PA has the following weld settings which can be utilised for each weld:
SQEEZE, UP 1, WELD 1, DOWN 1, HOLD, UP 2, WELD 2, DOWN 2 etc.
The welder has capability of using 3 pulses.
Using this functionality ensures that the heating up and cooling down of the weld is done in such a way to maximise weld strength and reduce embrittlement.