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Originally Posted by JDeereman
What special precautions, if any, need to be taken to put down a mig weld on the eyelet of a hydraulic cylinder rod? does the hydraulic cylinder need to be disconnected, drained and removed first? or can it be welded while in place? can the heat generated distort the rod? what is the best technique for damage-free grounding of the cylinder rod? anything else? thanks.
Theo
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Im not sure excatly what you are trying to do on the eyelet (put a new one on, or weld up a crack?) How big is the cylinder? If the cylinder has a long ram, I have put the cylinder in ice, to prevent the heat from transferring to the seals. Its always best to take it apart, but you might damage the seals then, anyway, so its a gamble. According to what size the ram is, depends on what welding method I would use. I prefer stick welding, on things that has stress. Unless you have a pretty good size mig welder, it may not hold the force.
If you are just building up the eyelet, then a mig should be OK, just protect everything.
Ive never done it, but if you are just going to weld a small amount, I guess you could leave it on the machine, just protect everything and keep feeling of the rod, where it goes in the cylinder, to make sure it doesnt get to hot. You could use a ice pack, or run water on it to keep it cool
Good Luck