Kwintsimi yokwenziwa kombhobho, imigangatho eyahlukeneyo kunye neenkcukacha kufuneka zilandelwe ukuqinisekisa umgangatho kunye nokhuseleko lwemveliso yokugqibela.I-ASTM A139ngomnye umgangatho onjalo odlala indima ebalulekileyo ekuveliseni imibhobho yentsimbi kwizicelo ezahlukeneyo.
I-ASTM A139 yinkcazo esemgangathweni ye-electrofusion (i-arc) ipayipi yensimbi edibeneyo (i-NPS 4 nangaphezulu).Ibandakanya iimfuno ze-spiral seam electrofusion (i-arc) edityanisiweyo, udonga olucekethekileyo, umbhobho wentsimbi ye-austenitic ukwenzela izicelo ezidlekayo okanye zobushushu obuphezulu.Lo mgangatho uchaza iimfuno zezinto eziphathekayo, iinkqubo zokuvelisa, imilinganiselo kunye neempawu zomatshini zemibhobho yensimbi.
Iimfuno zezinto eziphathekayo ze-ASTM A139 zichaza iindidi kunye namabakala ensimbi angasetyenziselwa ukwenza imibhobho.Oku kubandakanya ukubunjwa kweekhemikhali zentsimbi, ekufuneka iqulethe iipesenti ezithile zezinto ezifana nekhabhoni, i-manganese, i-phosphorus, isulfure kunye ne-silicon.Ezi mfuno zibalulekile ekuqinisekiseni ukuba intsimbi esetyenziswa kuyoimibhobhoihlangabezana namandla ayimfuneko kunye nemigangatho yokuxhathisa umhlwa.
Inkqubo yokwenziwa kombhobho we-ASTM A139 ibandakanya i-electrofusion (arc) welding, esebenzisa i-arc yombane ukuvelisa ubushushu obufunekayo ukuze udibanise imicu yentsimbi ibe yi-cylindrical shape.Le nkqubo ilawulwa ngononophelo ukuqinisekisa ukuba i-welds iphezulu kwaye ayinaziphene.Umgangatho ukwachaza iindlela zokuhlola ii-welds, ezifana novavanyo lwe-ultrasonic kunye novavanyo olukhokelelweyo lwe-bend, ukuqinisekisa ukuba bayahlangabezana nemigangatho yomgangatho ofunekayo.
Ngokwemilinganiselo, i-ASTM A139 ichaza iimfuno zobungakanani bombhobho, ubukhulu bodonga, kunye nobude.Oku kubandakanya ukunyamezela okuthe ngqo kwimilinganiselo yokuqinisekisa ukuba umbhobho udibana neenkcukacha eziyimfuneko zokusetyenziswa kwayo.Ezi mfuno ze-dimensional zibalulekile ekuqinisekiseni ukuba imibhobho ifakwe kwaye ixhunyiwe ngokuchanekileyo kwiintlobo ezahlukeneyo zezicelo.
Iipropathi zoomatshini ezinje ngokuqina kokuqina, amandla esivuno, kunye nobude bobude nazo zichaziwe kwi-ASTM A139.Ezi zakhiwo zibalulekile ekunqumeni amandla kunye nokusebenza kombhobho phantsi kweemeko ezahlukeneyo zokusebenza.Umgangatho ubeka iimfuno ezincinci kwezi zixhobo zomatshini ukuqinisekisa ukuba umbhobho unokumelana noxinzelelo olulindelekileyo, ubushushu kunye neemeko zokusingqongileyo.
Ngokubanzi, i-ASTM A139 idlala indima ebalulekileyo kwimveliso yeimibhobho yentsimbikwizicelo ezahlukeneyo.Ngokucacisa izinto eziphathekayo, iinkqubo zokuvelisa, imilinganiselo kunye neempawu zomatshini wemibhobho, umgangatho uqinisekisa ukuba imveliso yokugqibela ihlangabezana nemigangatho efunekayo kunye nemigangatho yokhuseleko.Inika abavelisi, iinjineli kunye nabasebenzisi bokugqibela ukuzithemba ukuba umbhobho uya kwenza njengoko kulindelwe kwisicelo esijoliswe kuyo.
Isishwankathelo, ukuqonda ukubaluleka kwe-ASTM A139 ekwenzeni umbhobho kubaluleke kakhulu ekuqinisekiseni umgangatho kunye nokhuseleko lweemveliso zepayipi zensimbi.Umgangatho ubeka iimfuno ezifunekayo kwizinto eziphathekayo, iinkqubo zokuvelisa, imilinganiselo kunye neempawu zemishini ukuqinisekisa ukuba imibhobho ihlangabezana nomgangatho ofunekayo kunye nemigangatho yokusebenza.Ngokunamathela kwi-ASTM A139, abavelisi banokuvelisa umbhobho wensimbi ophezulu ohlangabezana neemfuno zamashishini ahlukeneyo kunye nokusetyenziswa.
Ixesha lokuposa: Dec-28-2023