As a welder fabricator for a heavy equipment shop I do it all the time, if your talking about welding to the side of the cylinder just extend or retract the ram so the piston is as far from your work as possible and fill with water, don't cap it, use a piece of hose for a gravity siphon, steam can be dangerous.but not as dangerous as burning oil. the water will aide in keeping the distortion down to a minimum. if your welding to the boss end don't worry about it, extend and weld, no need for water.
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