Umbhobho wentsimbi odityanisiweyo: Umbhobho wentsimbi onomthungo kumphezulu wentsimbi okanye ipleyiti yentsimbi egotywe yaza yakhubazeka ukuba ibe setyhula okanye imilo yesikwere. Udonga lwangaphakathi lombhobho odibeneyo uneembambo ze-welding. Iimveliso eziphambili ziquka: i-ERW ipayipi yensimbi, i-LSAW ipayipi yensimbi kunye nombhobho wensimbi we-SSAW. Umbhobho wentsimbi luhlobo lwentsimbi ende enomngxuma, esetyenziswa njengomjelo wokuhambisa ulwelo, njengeoyile, igesi yendalo, amanzi, igesi, umphunga, njl.