Walking the cup is a TIG welding technique that works great on pipe.
...both butt welds and socket welds.
When there is adequate space around the joint, it works great and usually provides a much more uniform weld than you can get otherwise.
But sometimes, there is no room. There is stuff in the way that doesn't let you walk the cup.
...and Some industries dont even permit the cup walking technique due to the scratches it leaves on the metals surface.
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The great thing about cup walking is that you never have to prop your hand on the metal.
And that lets you weld long runs without stopping.
cup walking almost always lets you make a more uniform weld than freehanding.
But there are many many circumstances where walking the cup just wont work.
You need a certain amount of space to walk the cup and when making pipe welds in the field, sometimes there is stuff in the way. like other pipes, walls, pipe supports, you name it.
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"This product is the bomb.... full stop. Works for all types of welding. Never light up without one. Use it as a prop on your finger or just to rest the palm of your hand and scoot along. Can also double as a clamp pad so you don't scratch up something you don't want to. Couldn't be happier with this."
"Very Very Very useful product. Allows more time to concentrate on the weld rather waiting to see how heat your hand can take. I purchased several it was worth every low penny. 10 thumbs up."
Donald C. Cartier