Nrog rau kev tso tawm ntawm cov haujlwm tseem ceeb xws li lub teb chaws West-East Gas Transmission, polyethylene-PE (polyethylene) pipelines tau dhau los ua ntau dua. Tam sim no, cov khoom no tau siv dav hauv cov pa roj, nkev, dej thiab lwm yam kev lag luam.
PE pipelines muaj cov yam ntxwv ntawm kev tsim kho yooj yim, ceev ceev, corrosion kuj, tsis muaj kuab paug, thiab kev pab lub neej ntev. Muaj ob txoj hauv kev txuas rau PE kav: kub yaj vuam tshuab kev sib txuas thiab kub yaj vuam tshuab kev sib txuas. Tam sim no, cov kav dej tseem ceeb tau txuas nrog siv cov tshuab kub yaj vuam tshuab. Lub hauv paus ntsiab lus ntawm kev sib txuas ntawm lub tshuab kub yaj welding yog muab qhov chaw sib txuas ntawm ob lub PE kav ze rau cov cuab yeej cua sov kom sov lub ntsej muag lub ntsej muag kom txog thaum lawv yaj. Tom qab tshem tawm cov cuab yeej cua sov, ob lub ntsej muag kawg molten raug coj los ze ua ke. Nyob rau hauv qhov kev txiav txim siab Cia nws cia kom txog thaum lub sib koom ua ke txias thiab ua ib chav tsev.
1. Kev npaj vuam. Kev npaj ua hauj lwm rau kub yaj welding tshuab welding siv yog raws li nram no:
①Ntxig cov ntawv hlais nrog cov lus qhia zoo ib yam li cov yeeb nkab rau hauv tus ncej;
② Npaj cov kev txhawb nqa txaus los xyuas kom meej tias cov yeeb nkab yuav tsum tau welded tuaj yeem nyob ntawm qhov siab tib yam li cov kab nruab nrab ntawm tus ncej thiab tuaj yeem txav tau yooj yim;
③ Teem lub phaj cua sov rau 200 ~ 230 degree;
④ Tig lub zog ntawm lub tshuab hluav taws xob kub yaj, tig rau ntawm lub phaj cua sov, milling cutter thiab roj twj tso kua mis hloov thiab sim khiav.
2. Vuam. Cov txheej txheem vuam ntawm lub tshuab kub yaj welding yog raws li hauv qab no: xyuas cov yeeb nkab thiab ntxuav cov yeeb nkab kawg → Tighten cov yeeb nkab → Twj cov yeeb nkab kawg nrog lub milling cutter → Txheeb xyuas qhov tsis zoo thiab qhov sib txawv ntawm cov yeeb nkab kawg → Cua sov cov yeeb nkab thiab saib xyuas qhov tsawg kawg nkaus crimp qhov siab → Weld cov yeeb nkab thiab txias rau lub sij hawm teev → Tshem cov tubing. Thaum lub sij hawm vuam txheej txheem, tus neeg teb xov tooj yuav tsum xa mus rau qhov tsis muaj daim npav txheej txheem vuam, thiab thaum tsim nyog, ua kom haum raws li cov kev hloov hauv huab cua, qhov kub thiab txias, thiab lwm yam.:
① Txheeb xyuas seb qhov kev qhia tshwj xeeb thiab qib siab ntawm cov yeeb nkab yuav tsum tau welded puas yog, thiab xyuas seb puas muaj pob, pob lossis khawb ntawm qhov chaw. Yog tias qhov tob ntawm qhov khawb ntau tshaj 10% ntawm phab ntsa tuab ntawm cov yeeb nkab, nws yuav tsum tau muab tshem tawm ib nrab ua ntej siv;
② Siv cov ntawv mos lossis daim ntaub dipped hauv cawv kom tshem tawm cov roj stains lossis cov khoom txawv teb chaws ntawm ob qhov kawg ntawm cov kav dej;
③ Muab cov yeeb nkab uas yuav tsum tau welded nyob rau hauv cov thav duab ntawm cov thav duab kom qhov ntev protruding los ntawm ob qho tib si kawg yog sib npaug (raws li luv li sai tau yam tsis cuam tshuam rau milling thiab cua sov, nyiam dua 20 ~ 30mm). Cov khoom siv uas tsis yog cov yeeb nkab thav duab yog siv Tuav cov kev txhawb nqa kom lub axis ntawm cov yeeb nkab thiab cov kab nruab nrab ntawm cov ncej yog nyob rau tib qhov siab, thiab tom qab ntawd nruj nreem nrog cov ntawv nplaum;
④Ntxig lub tshuab txiav, ua ntej tig lub zog hloov ntawm lub tshuab txiav, tom qab ntawd kaw ob qhov kawg ntawm cov yeeb nkab thiab siv qhov tsim nyog kom txog thaum cov chips txuas ntxiv tshwm sim ntawm ob qhov kawg (cov nti tuab yog 0.5 ~ 10mm) . Los ntawm kev kho qhov siab ntawm milling hniav Adjustable nti thickness), tshem tawm lub siab, tos ib pliag, ces tshem tawm lub movable ncej, thiab tua lub hwj chim ntawm lub milling cutter;
⑤ Tshem tawm cov milling cutter, kaw ob lub yeeb nkab kawg, thiab xyuas qhov kev sib dhos ntawm ob qhov kawg (qhov tsis zoo ntawm ob qhov kawg ntawm cov yeeb nkab tsis tuaj yeem tshaj 10% ntawm phab ntsa tuab, uas tuaj yeem txhim kho los ntawm kho qhov ncaj ntawm cov yeeb nkab thiab elastic slips; qhov sib txawv ntawm ob qhov kawg ntawm cov yeeb nkab tsis tuaj yeem tshaj 0.3mm (hauv qab de225mm), 0.5mm (de225mm ~ 400mm), 1mm (de400mm lossis siab dua), yog tias nws tsis tau raws li qhov yuav tsum tau ua, nws yuav tsum tau milled ntawm no kom txog rau thaum nws ua tau raws li qhov yuav tsum tau ua.
⑥ Tom qab qhov kub ntawm cov cua sov phaj ntawm lub tshuab kub yaj welding mus txog qhov tsim nyog, muab tso rau hauv lub thav duab thiab siv lub zog tshwj xeeb kom txog rau thaum qhov tsawg kawg nkaus curling ntug ntawm ob sab mus txog qhov siab uas tau teev tseg, thiab lub siab raug txo mus rau tus nqi teev. (qhov chaw nruab nrab ntawm ob sab ntawm cov yeeb nkab kawg thiab cov phaj cua sov yog txoj cai cia rau hauv kev sib cuag thiab nqus cua sov). Tom qab lub sijhawm dhau los, tso cov thav duab txav tau sai, tshem tawm cov phaj cua sov sai sai, thiab tom qab ntawd kaw ob lub yeeb nkab kawg. Lub sijhawm hloov pauv yuav tsum tau luv kom ntau li ntau tau. Tom qab txias rau lub sijhawm teev tseg, tso lub siab, tso cov ntawv nplaum, thiab tshem tawm qhov kev sib txuas. Cov yeeb nkab tiav.
3. Vuam txheej txheem tsis kub yaj welding tshuab Cov tsis ncaj qha ntsig txog vuam yog: kub, sijhawm thiab siab.
