electrical welding means for adding material to the valve body having {HEAD ~ an electrode} to provide an arc and {TAIL ~ wire} adding means to provide the material 
to provide
electrical welding means for adding material to the valve body having { HEAD ~ an electrode } to provide an arc and { TAIL ~ wire } adding means to provide the material
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH