Dab tsi tiv thaiv roj lossis roj ua haujlwm zoo nrog gmaw vuam?

GMAW (roj hlau hlau vuam), feem ntau yog cov duab vuam, nyob ntawm cov pa roj weld los tiv thaiv cov pa weld Txoj cai tiv thaiv cov roj tsis tsuas yog tiv thaiv tsis xws li tab sis kuj cuam tshuam kev ruaj khov Arc ruaj khov, weld hlaws tsos, thiab nkag mus. Thaum tsis muaj ib qho roj ua haujlwm rau txhua cov ntaub ntawv, Argon, carbon dioxide (co₂), thiab kev sib xyaw tshwj xeeb, nrog kev sib xyaw tshwj xeeb, txhuas, thiab lwm yam alloys.
Cov yuav tsum tau rau GMAW tiv thaiv roj
Kev thaiv cov roj rau GMAW yuav tsum ua raws li peb cov qauv tseem ceeb:
• Kev tiv thaiv kev paug: Thaiv cov pa roj atmoschlys los ntawm kev cuam tshuam nrog cov hlau molten.
• Arc ruaj khov: Tswj lub arc zoo ib yam los tswj cov tswv yim thaum tshav kub thiab weld hlaws duab.
• Cov khoom siv tau: Zam kev siv cov hlau los yog cov xaij hlau (piv txwv li, oxidation ntawm txhuas lossis cov pa roj carbon pickup hauv stainless hlau).
Cov kev xav tau no cov ntaub ntawv sib txawv los ntawm cov khoom siv, cov tuab, thiab cov ntawv thov}, helium, helium), re₂), lossis sib xyaw.
Inert gases: zoo tagnrho rau tsis - ferrous hlau
Inert gases (Argon, hels) tsis txhob hnov ​​nrog cov hlau, ua rau lawv qhov tseem ceeb rau kev vuam aluminium, tooj liab, thiab lwm yam tsis {{ferrous alloys.
Argon (ar): lub hauv paus ntau yam
Ntshiab Agon yog lub hauv paus ntawm GMAW tiv thaiv rau tsis - ferrous hlau. Nws cov thermal qis conditionivity tsim ib qho ruaj khov, tsom mus ua haujlwm zoo rau cov khoom siv nyias nyias (piv txwv li gauge alias almes). Argon lub ntom ntom (1.38 lub sij hawm uas huab cua) ua rau cov ntaub thaiv npog, thiab nws txwv tsis pub dhau Aluminium
Rau txhuas Gmaw, Ntshiab Argon yog Txuj Ci. Nws ntseeg tau cov xaub xaub ntws tawm hauv lub pas dej weld zoo thiab zam cov pa oxide uas tsis muaj zog pob qij txha.
Helium (nws): Txhawb cov kev nkag mus rau hauv cov alloys tuab
Helium, lub nkig roj sib zog, nce arc kub vim nws lub siab thermal conductivity. Qhov no ua rau nws muaj txiaj ntsig zoo tsis- ferrous hlau (piv txwv li, 1} nti txhuas qhov chaw uas xav tau. Helium-Argon Blends (piv txwv li, 75% nws / 25% AR) tshuav kev sib tw thiab ARC ruaj khov, feem ntau siv nyob rau hauv Aerospace cov ntawv thov uas muaj cov khoom siv txhuas uas yuav tsum tau ua tiav.
Txawm li cas los xij, helium yog muaj nqi thiab tsis tshua muaj txiaj ntsig hauv kev sau ntawv (vim tsawg dua), txwv nws siv rau cov phiaj xwm tshwj xeeb.
Reactive gases: optimized rau ferrous hlau
Cov roj av zoo li sib cuam tshuam me me nrog hlau tab sis txhim kho arc kev ua tau, ua rau lawv zoo tagnrho rau cov carbon thiab qis {{{{}} cov hlau almoy.
Cov pa roj carbon dioxide (CO₂): Nqi -}}}}}} Siv tau zoo rau cov hlau
Cov ntshiab yeem yog ib qho staple rau gmaw vuam ntawm cov meld hlau thiab qis - allloy steel. Nws cov teeb meem reactive (nws cais tawm me ntsis hauv arc) Tsim qhov kub tshaj lij arc) tsim qhov nkag siab hauv cov ntaub ntawv tuab (piv txwv li}} nti carbon hlau daim hlau). CO₂ kuj txo lub ntsej muag piv rau cov laus flux- tseem ceeb tshaj li argon {}}, automotive poste vuam).
Thaum boli tuaj yeem ua rau cov xov tooj me, hlau cov tub lim dej (piv txwv li, muaj deoxidizers (silicon, manganese) uas nruab nrab welds.
Argon - bovts: ntsuas qhov zoo thiab tus nqi
Blends ntawm Argon thiab CO₂ (piv txwv li, 75% Hla, 90%? Lawv muab sib xyaw argon lub cev ruaj khov nrog kev nkag mus, muab:
• Smooter Weld Beads: Argon txo qhov sib luag rau cov ntshiab?
• Versatility hla thicknesses: 75/25 xyaw ua haujlwm rau ob qho tib si nyias (18-ntiv tes) thiab tuab (1-nti), yoog raws li kev lag luam, thiab kev siv tshuab thiab kev siv tshuab.
• Txo porosity: Argon Cov Shenser Shield Lovard Nitrogen tos, ib qho kev ua rau pores hauv cov ntshiab boo₂ {}} shielded welds.
Lub 90/10 sib xyaw yog qhov zoo dua rau qis - cov xim sib tw, raws li nws cov ntsiab lus bule recuces txo cov roj av.
Tshwj xeeb sib xyaw rau stainless hlau thiab high -} Cov hlau alloy}
Stainless hlau thiab high -}}}}}} ecoys yuav tsum tau tiv thaiv roj uas tiv thaiv kev ua kom xeb (corrosion tsis kam) thiab kom tsis txhob tsim carbide.
Argon - be₂ -} oxygen froms rau stainless hlau
Rau ustenitic steel hlau (piv txwv li, 304, 316), sib xyaw zoo li 90%) xws li 90% CO₂ / 2% O₂ tshuav ARC ruaj thiab tswj cov oxidation. Oxygen txhim khu kev "Watting" ntawm Weld Pas Dej (ua kom muaj kev sib tw weld (ua kom muaj kev sib tw ua kom dhau los) tsis muaj ntau dhau oxidation, thaum argon minimizes nitrogen tuaj tos. Qhov sib xyaw no yog cov qauv hauv cov khoom noj ua khoom noj, qhov twg corrosion kuj tsis {{9} kev sib ceg.
Argon - helium rau high-} nickel alloys
Alloys zoo li inconel (siv nyob rau hauv Aerospace thiab kev ua tshuaj lom neeg) yuav tsum muaj kev tiv thaiv kom tsis txhob muaj paug. Argon - Helium blends (piv txwv li, 70% ar / 30% nws) muab cov ntu tuab thaum tiv thaiv Nickel txoj kev xeb. Helium's Arc Tshav Kub ua kom muaj kev lom zem puv nkaus Fusion tsis muaj kev cuam tshuam nrog cov alloy.
Qhov tseem ceeb hauv kev xaiv roj
Xaiv txoj cai gmaw tiv thaiv roj nyob ntawm:
• Puag hlau: Aluminium yuav tsum tau ntshiab argon; Cov hlau me me ua haujlwm nrog kev sib koom ua ke; Stainless hlau xav tau Argon - mixen sib xyaw.
• Cov ntaub tuab: Cov hlau nplaum: cov hlau nyias nyias (tsawg dua lossis sib npaug ¼ ¼} ntev kev nplua nuj rau qhov ntsuas; Cov hlau tuab (ntau dua los yog sib npaug rau ½ nti) Siv helium {1} {}} argon rau kev nkag mus.
• Weld visibility: Rau Welrorative lossis WRDSRANTS), Argron {}} ₂ {b₂₂ ₂₂ ₂ ₂ ₂ ₂ ₂ ₂ ₂ ₂ ₂ ₂ ₂ ₂ ₂} b₂₂ ₂ ₂} b₂₂ ₂₂₂ ₂} b₂₂ ₂₂ ₂} b₂₂ ₂₂ ₂₂ ₂ ₂ ₂ sib xyaw ua kom tiav.
• Tus nqi: Lub ntsej muag dawb huv yog pheej yig tshaj rau cov hlau; Argon lossis Helium Blends yog cov roj ntsha tab sis tsim nyog rau tsis {{0} -}}}}}}}}}}}}}}} cov hlau alloy.
Kev coj ua zoo tshaj plaws rau GMAW tiv thaiv roj
Kom ua hauj lwm zoo tshaj plaws:
• Tswj cov Flat Rates: 20-30 CUBH (cubic feet ib teev) ua haujlwm rau cov ntawv thov feem ntau. Tsawg dhau ib qho ntws tawm ntawm lub weld nthuav tawm; Siab heev ua rau muaj dej khov uas rub tawm hauv huab cua.
• Sib phim roj kom cov xaim xaim: siv cov xov hlau desexidized (piv txwv li, er70s-}}}
•Avoid Contamination: Ensure gas lines are dry and free of debris-moisture causes hydrogen-induced porosity, especially in steel.​
• Kuaj rau cov ntawv sau: hauv cov chaw muaj cua hlob (piv txwv li, siv cua tshuab), siv cov cua tshuab lossis hloov mus rau cov pa hluav taws xob (argon) kom muaj cov ntaub thaiv npog.
Xaus: Tsis muaj ib tug {- loj} {1} -}} txhua yam, tab sis ntshiab qhia
Qhov zoo tshaj plaws GMAW tiv thaiv gases nyob ntawm cov khoom:
• Aluminium / Tsis - ferrous: Ntshiab (nyias) lossis Argon {}} helium blends (tuab).
• Me / Tsawg {{- alloy steel: 75% ar / 25% CO (Versatility) lossis dawb huv (tus nqi).
• Stainless hlau: Argon - be {}}} e oxygen sib xyaw los khaws cov corrosion tsis kam.
Los ntawm kev xaiv roj ua kom haum nrog cov khoom siv, tuab, thiab cov khoom siv tau zoo, cov khoom siv dawb}} Cov khoom siv dawb, lossis cov khoom siv kho mob steel. Txoj cai tiv thaiv roj tsis yog ib qho cuab yeej; Nws yog lub hauv paus ntawm kev txhim khu kev qha gmaw ua tau.