Hey all. Does anyone have any experience welding precious metals such as platinum alloys (platinum/nickel/tungsten) to other alloys, mostly a Ni/Cr mix. Trying to get a sufficient weld of both .030 diameter platinum alloy spheres and .046 diameter by .100 long platinum alloy "cylinders" TO a flat .055 thk X .105 wide by "any length" Ni/Cr alloy. The weld is subject to extreme heat and presuure as well as chemical exposure. Right now using a Unitek/Myachi HF DC system with argon gas shielding. Still getting cracking at the weld interface under magnification. Basically, the weld is failing after an insufficeint amount of time and the welded alloy falls off the base metal. If anyone knows anything about this, even a little, I can provide some specifics on the weld parameters I'm using.