During {HEAD ~ welding} with {TAIL ~ high output power}, the gaps between the pieces being joined may not exceed a maximal gap width 
with
During { HEAD ~ welding } with { TAIL ~ high output power } , the gaps between the pieces being joined may not exceed a maximal gap width
OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH