Chitoliro chachitsulo chowotcherera chimatanthawuza chitoliro chachitsulo chokhala ndi seam pamwamba chomwe chimapangidwa ndi kupindika zitsulo kapena mbale zachitsulo kukhala zozungulira, masikweya, ndi mawonekedwe ena ndikuwotcherera. Billet yomwe imagwiritsidwa ntchito popanga mapaipi achitsulo ndi mbale yachitsulo kapena chitsulo. Kuyambira m'ma 1930, ndi chitukuko chachangu cha apamwamba Mzere zitsulo mosalekeza anagubuduza kupanga ndi kupita patsogolo kwa kuwotcherera ndi kuyendera ukadaulo, khalidwe la welds wakhala mosalekeza bwino, zosiyanasiyana ndi specifications welded mipope zitsulo chawonjezeka, ndipo iwo alowa m'malo. mipope yachitsulo yopanda msoko m'minda yambiri. Mipope yachitsulo yonyezimira imakhala ndi ndalama zotsika komanso zopangira zokwera kwambiri kuposa mapaipi opanda zitsulo.

Mapaipi achitsulo amagawidwa m'mapaipi opanda msoko komanso otsekemera. Welded mapaipi anawagawa molunjika msoko mipope zitsulo ndi mipope zitsulo ozungulira. Msoko wowotcherera mipope amagawidwa mu chitoliro chachitsulo cha ERW (kuwotcherera kwanthawi yayitali) ndi chitoliro chachitsulo cha LSAW (kuwotcherera kwa msoko wowongoka pansi pamadzi). The kuwotcherera ndondomeko mipope ozungulira ndi kusiyana m'madzi arc kuwotcherera (SSAW zitsulo chitoliro mwachidule) ndi LSAW zitsulo chitoliro mu mawonekedwe a welds, ndi kusiyana ndi ERW ndi kusiyana ndondomeko kuwotcherera. Kuwotcherera kwa arc (SAW chitsulo chitoliro) kumafuna kuwonjezera kwa sing'anga (waya wowotcherera, flux), koma ERW safuna. ERW imasungunuka ndi kutentha kwapakati. Mapaipi achitsulo amatha kugawidwa m'magulu awiri molingana ndi njira yopangira: mapaipi achitsulo osasunthika ndi mapaipi opangira zitsulo. Mipope yachitsulo yopanda msoko ingagawidwe m'mapaipi opanda msoko otenthedwa ndi otentha, mapaipi okokedwa ndi ozizira, mapaipi achitsulo olondola, mapaipi owonjezera otentha, mapaipi ozungulira ozizira, ndi mapaipi otuluka molingana ndi njira yopangira. Mipope yachitsulo yosasunthika imapangidwa ndi chitsulo chapamwamba kwambiri cha carbon kapena alloy steel ndipo amagawidwa kukhala otentha-wodzigudubuza ndi ozizira (wokoka).

Njira yopanga mipope yowongoka ya msoko wowongoka ndiyosavuta, yokhala ndi magwiridwe antchito apamwamba, otsika mtengo, komanso chitukuko chofulumira. Mphamvu ya mipope yowotcherera yozungulira nthawi zambiri imakhala yokwera kuposa mipope yowongoka yowotcherera. Mabotolo ocheperako atha kugwiritsidwa ntchito kupanga mapaipi owotcherera okhala ndi mainchesi okulirapo, ndipo mabaluti a m'lifupi mwake amathanso kugwiritsidwa ntchito kupanga mapaipi owotcherera okhala ndi ma diameter osiyanasiyana. Komabe, poyerekeza ndi mipope yowongoka yautali womwewo, kutalika kwa weld kumawonjezeka ndi 30 ~ 100%, ndipo liwiro lopanga ndilotsika. Chifukwa chake, mapaipi ang'onoang'ono ang'onoang'ono amawotcherera nthawi zambiri ndi kuwotcherera kwa msoko wowongoka, pomwe mapaipi akulu akulu akulu amawotcherera ndi kuwotcherera kozungulira.