Kwicandelo lokwenziwa kweepayipi, kufuneka kulandelwe imigangatho eyahlukeneyo kunye neenkcukacha ukuqinisekisa umgangatho kunye nokhuseleko lwemveliso yokugqibela.I-ASTM A139ngomnye wemigangatho enjalo odlala indima ebalulekileyo ekuvelisweni kwemibhobho yentsimbi kwiindlela ezahlukeneyo zokusebenza.
I-ASTM A139 yinkcazo eqhelekileyo yombhobho wentsimbi odityanisiweyo nge-electrofusion (arc) (NPS 4 nangaphezulu). Igubungela iimfuno zombhobho wentsimbi odityanisiweyo nge-electrofusion (arc) yomthungo ojikelezayo, udonga olubhityileyo, umbhobho wentsimbi odityanisiweyo we-austenitic wokusetyenziswa kwe-corrosive okanye ubushushu obuphezulu. Lo mgangatho uchaza iimfuno zezixhobo, iinkqubo zokuvelisa, ubungakanani kunye neempawu zoomatshini zemibhobho yentsimbi.
Iimfuneko zezinto ze-ASTM A139 zichaza iintlobo kunye neendidi zentsimbi ezinokusetyenziselwa ukwenza imibhobho. Oku kuquka ukwakheka kweekhemikhali zentsimbi, ekufuneka zibe neepesenti ezithile zezinto ezifana nekhabhoni, i-manganese, i-phosphorus, i-sulfur kunye ne-silicon. Ezi mfuneko zibalulekile ekuqinisekiseni ukuba intsimbi esetyenziswayoimibhobhoihlangabezana nemigangatho yamandla afunekayo kunye nokumelana nokugqwala.
Inkqubo yokuvelisa ipayipi ye-ASTM A139 ibandakanya ukuwelda nge-electrofusion (arc), esebenzisa i-arc yombane ukuvelisa ubushushu obufunekayo ukuwelda imicu yentsimbi ibe yimo ye-cylindrical. Le nkqubo ilawulwa ngononophelo ukuqinisekisa ukuba ukuwelda kusemgangathweni ophezulu kwaye akunaziphene. Umgangatho ukwachaza neendlela zokuhlola ukuwelda, njengovavanyo lwe-ultrasonic kunye novavanyo lokugoba oluqondiswe ngendlela enqamlezileyo, ukuqinisekisa ukuba ziyahlangabezana nemigangatho yomgangatho efunekayo.
Ngokuphathelele ubukhulu, i-ASTM A139 ichaza iimfuno zobungakanani bombhobho, ubukhulu bodonga, kunye nobude. Oku kuquka ukunyamezelana okuthile kwiimilinganiselo ukuqinisekisa ukuba umbhobho uhlangabezana neemfuno ezifunekayo zokusetyenziswa kwawo. Ezi mfuno zibalulekileyo ekuqinisekiseni ukuba imibhobho ifakiwe kwaye iqhagamshelwe ngokuchanekileyo kwiindlela ezahlukeneyo zokusetyenziswa.
Iimpawu zoomatshini ezifana namandla okutsalwa, amandla okukhupha, kunye nokwandiswa kwazo zichazwe kwi-ASTM A139. Ezi mpawu zibalulekile ekumiseleni amandla kunye nokusebenza kombhobho phantsi kweemeko ezahlukeneyo zokusebenza. Umgangatho ubeka iimfuno ezincinci zezi mpawu zoomatshini ukuqinisekisa ukuba umbhobho unokumelana noxinzelelo olulindelekileyo, ubushushu kunye neemeko zokusingqongileyo.
Lilonke, i-ASTM A139 idlala indima ebalulekileyo ekuvelisweniimibhobho yentsimbikwizicelo ezahlukeneyo. Ngokuchaza izixhobo, iinkqubo zokuvelisa, ubungakanani kunye neempawu zoomatshini zemibhobho, umgangatho uqinisekisa ukuba imveliso yokugqibela ihlangabezana nemigangatho yomgangatho kunye nokhuseleko olufunekayo. Inika abavelisi, iinjineli kunye nabasebenzisi bokugqibela ukuzithemba kokuba umbhobho uza kusebenza njengoko kulindelwe kwisicelo sawo esicetywayo.
Ngamafutshane, ukuqonda ukubaluleka kwe-ASTM A139 ekwenzeni iipayipi kubalulekile ekuqinisekiseni umgangatho kunye nokhuseleko lweemveliso zeepayipi zentsimbi. Umgangatho ubeka iimfuno ezifunekayo zezixhobo, iinkqubo zokuvelisa, ubukhulu kunye neempawu zoomatshini ukuqinisekisa ukuba iipayipi ziyahlangabezana nemigangatho yomgangatho kunye nokusebenza okufunekayo. Ngokulandela i-ASTM A139, abavelisi banokuvelisa iipayipi zentsimbi ezikumgangatho ophezulu ezihlangabezana neemfuno zamashishini kunye nezicelo ezahlukeneyo.
Ixesha lokuthumela: Disemba-28-2023