COV TSWV YIM RAU COV CWJ PWM THERMOPLASTICS

Vuam yog txheej txheem ntawm kev cais chaw tsis tu ncua los ntawm kev ua kom mos nrog cua sov. Thaum vuam thermoplastics, ib qho ntawm cov khoom tseem ceeb yog cov khoom siv nws tus kheej. Ntev npaum li cov yas vuam tau nyob ib puag ncig ntau tus neeg tseem tsis nkag siab txog qhov pib, uas yog qhov tseem ceeb rau qhov tsim nyog weld.
Tus naj npawb ib txoj cai ntawm vuam thermoplastics yog koj yuav tsum muab cov hlau zoo li-yas zoo li. Txhawm rau kom tau txais lub zog muaj zog, txuas rau weld, nws yog ib qho tsim nyog yuav tsum ua kom koj cov xaim qis thiab koj lub vuam txuas yog qhov sib luag; Piv txwv li, polypropylene rau polypropylene, polyurethane mus rau polyurethane, los yog polyethylene rau polyethylene.
Nov yog qee qhov lus qhia rau vuam sib txawv ntawm ntau yam ntawm cov yas thiab cov kauj ruam los xyuas kom meej kev tsim nyog hlau.
Vuam Polypropylene
Polypropylene (PP) yog ib qho yooj yim thermoplastics rau weld thiab yog siv rau ntau daim ntawv thov sib txawv. PP muaj tshuaj lom neeg kuj zoo heev, tsis tshua muaj kev sib tsoo, siab tensile zog thiab yog polyolefin feem ntau dimensionally ruaj khov. Cov ntaub ntawv pov thawj uas siv PP yog cov khoom siv plating, tso tsheb hlau luam, ductwork, etchers, fume hoods, txhuam siv thiab orthopedics.
Txhawm rau kev sib txuas ntawm PP, qhov txuas ntawm qhov yuav tsum tau teeb tsa ntawm kwv yees li 572 ° F / 300 ° C; txiav txim siab koj qhov kub thiab txias yuav nyob ntawm hom welder koj yuav thiab cov lus pom zoo los ntawm cov neeg tsim khoom. Thaum siv lub tshuab hluav taws xob thermoplastic nrog 500 watt 120 volt cua sov caij, cov cua tswj qhov cua yuav tsum tau tsim muaj kwv yees li 5 psi thiab rheostat ntawm 5. Los ua cov kauj ruam no, koj yuav tsum nyob thaj tsam ntawm 572 ° F / 300 ° C.
Vuam Polyethylene
Lwm qhov yooj yim ncaj ncees thermoplastic rau weld yog polyethylene (PE). Polyethylene yog qhov cuam tshuam tsis kam, muaj kev txhim kho tshwj tsis zoo, siab ua tau lub zog loj, yog cov khoom siv tau thiab tsis tshua muaj dej nqus. Cov ntawv thov pov thawj rau PE yog txoj hauv kev thiab cov kab nrig, tso tsheb hlau luam, cov nkoj tua tau, ntsuas cov laug cam thiab swb.
Txoj cai tseem ceeb tshaj plaws txog vuam polyethylene yog tias koj tuaj yeem weld qis rau qib siab tab sis tsis siab rau tsawg. Lub ntsiab lus, koj tuaj yeem weld tsawg ntom polyethylene (LDPE) vuam pas nrig mus rau high ntom polyethylene (HDPE) ntawv tab sis tsis hloov ua lwm yam. Qhov laj thawj yog yooj yim heev. Qhov ntau dua qhov ntom ntog nws nyuaj dua yog kev zom cov khoom sib txuas ua rau weld. Yog tias cov cheebtsam tsis tuaj yeem tawg nyob rau ntawm tib tus nqi ces lawv tsis tuaj yeem koom ua ke kom zoo. Lwm yam tshaj li kev paub tseeb tias koj cov qhov ceev tau zoo, polyethylene yog cov yas yooj yim zoo nkauj rau qhov weld. Txhawm rau weld LDPE koj yuav tsum muaj qhov kub li ntawm 518 ° F / 270 ° C, tus tswj kev teeb tsa ntawm kwv yees li 5-1 / 4 txog 5-1 / 2 thiab rheostat ntawm 5. Zoo li PP, HDPE yog weldable ntawm 572 ° F / 300 ° C.
Cov Lus Qhia rau Cov Welds Zoo
Ua ntej vuam thermoplastics, muaj ob peb kauj ruam yooj yim uas yuav tsum tau ua kom ntseeg tau tias qhov weld tsim nyog. Ntxuav txhua qhov chaw, suav nrog tus pas hlau, nrog MEK lossis cov kuab zoo sib xws. Groove lub substrate loj txaus los lees txais lub vuam pas nrig thiab tom qab ntawd txiav qhov kawg ntawm vuam pas nrig mus rau 45 ° kaum sab xis. Thaum tus welder tau hloov kho rau qhov ntsuas kub kom haum, koj yuav tsum npaj rau qhov chaw thiab vuam txuas. Los ntawm kev siv lub tshuab ua haujlwm tsis siv neeg nrawm ntau qhov kev npaj ua haujlwm tau ua tiav rau koj.
Tuav lub welder txog li ib nti saum toj ntawm lub substrate, ntxig rau txoj hlua hlau txuas rau qhov taub thiab txav nws hauv qhov nce thiab nqis ntawm peb mus rau plaub zaug. Ua qhov no yuav ua kom sov lub vuam pas nrig thaum cua sov lub substrate. Qhov taw qhia qhov substrate yog npaj tau los ua welded yog thaum nws pib tau txais cov pos huab - zoo ib yam li tshuab ntawm daim iav.
Siv tawv khov kho thiab xwm yeem, thawb lub pob tw ntawm qhov ntxeev. Cov khau raj yuav thawb lub Vuam pas nrig mus rau hauv lub substrate. Yog tias koj xaiv, thaum lub vuam qws ua raws li cov khoom loj, koj tuaj yeem tso tus pas nrig thiab nws yuav cia li rub nws tus kheej mus dhau.
Feem ntau cov thermoplastics yog sandable thiab lub dag lub zog ntawm cov weld yuav tsis tsum cuam tshuam thaum sanded. Kev siv 60-grit sandpaper, xuab zeb tawm sab saum toj kawg ntawm cov vuam tsoo, tom qab ntawd ua haujlwm koj txoj haujlwm txog li 360-grit ntub dej pleev xim kom tau txais kev ua tiav zoo. Thaum ua haujlwm nrog polypropylene lossis polyethylene, nws muaj peev xwm rov ua kom lawv cov ntsej muag ci ntsa iab los ntawm maj mam cua sov saum npoo av nrog daj qhib cov nplaim taws hluav taws kom cig. (Nco ntsoov tias cov txheej txheem kev nyab xeeb ib txwm yuav tsum tau ua.) Thaum cov kauj ruam no ua tiav koj yuav tsum muaj lub weld uas zoo ib yam li daim duab hauv qab sab laug.
Xaus

Ua raws li cov lus qhia saum toj no nyob rau hauv siab, vuam thermoplastics yuav yog qhov txheej txheem ncaj ncees rau kev kawm. Ob peb teev ntawm kev xyaum vuam yuav muab qhov "xav tias" rau kev tuav txoj cai txawm tias nias rau ntawm tus pas nrig ncaj nraim mus rau hauv thaj chaw txuas. Thiab kev sim rau ntau hom plastics yuav pab tswj tus txheej txheem. Txog rau lwm cov txheej txheem thiab cov qauv, tiv toj rau koj lub chaw xa khoom plastics.


Lub sij hawm tshaj tawm: Kaum Hlis-12-2020