The electrical welding device adds material to {HEAD ~ the inside} of {TAIL ~ the valve body} by using an electrode to provide an arc 
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The electrical welding device adds material to { HEAD ~ the inside } of { TAIL ~ the valve body } by using an electrode to provide an arc
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH