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