Vuam Technique for TIG welding

Qhov vuam tam sim no ntawm tungsten inert gas arc vuam feem ntau yog xaiv raws li cov khoom siv, tuab, thiab qhov chaw ntawm qhov chaw ua haujlwm. Raws li cov vuam tam sim no nce, qhov nkag mus tob zuj zus, thiab qhov dav thiab qhov siab tshaj ntawm qhov vuam seam me ntsis nce, tab sis qhov nce me me. Ntau dhau los yog tsis txaus welding tam sim no tuaj yeem ua rau cov vuam tsis zoo lossis vuam tsis zoo.

Lub arc voltage ntawm tungsten inert gas vuam yog tsuas yog txiav txim los ntawm qhov ntev arc. Raws li qhov ntev ntawm qhov arc nce, qhov arc voltage nce, qhov dav dav dav nce, thiab qhov nkag mus tob zuj zus. Thaum lub arc ntev dhau lawm thiab lub arc voltage siab dhau lawm, nws yog ib qho yooj yim los ua tsis tiav vuam thiab undercutting, thiab cov nyhuv tiv thaiv tsis zoo.
Tab sis lub arc tsis tuaj yeem luv dhau. Yog tias qhov hluav taws xob arc qis dhau los yog qhov arc luv dhau, cov vuam hlau yog qhov luv luv thaum nws kov cov tungsten electrode thaum pub mis, ua rau cov tungsten electrode hlawv tawm thiab yooj yim tungsten. Yog li ntawd, qhov ntev arc feem ntau yog kwv yees li sib npaug ntawm txoj kab uas hla ntawm tungsten electrode.

Thaum vuam ceev nce, qhov tob thiab dav ntawm fusion txo. Thaum lub vuam ceev ceev heev, nws yog ib qho yooj yim los tsim tsis tiav fusion thiab nkag mus. Thaum lub vuam ceev qeeb dhau lawm, lub vuam seam yog dav thiab tej zaum kuj muaj qhov tsis xws luag xws li weld to thiab hlawv. Thaum lub sij hawm phau ntawv tungsten inert gas welding, qhov vuam ceev feem ntau yog hloov kho txhua lub sij hawm raws li qhov loj, zoo, thiab fusion qhov teeb meem ntawm lub pas dej molten.

1. Nozzle txoj kab uas hla
Thaum lub nozzle txoj kab uas hla (xa mus rau lub puab txoj kab uas hla) nce, qhov txaus tus nqi ntawm kev tiv thaiv roj yuav tsum tau nce. Lub sijhawm no, thaj chaw tiv thaiv yog qhov loj thiab kev tiv thaiv zoo. Tab sis thaum lub nozzle loj dhau lawm, nws tsis tsuas yog nce kev noj cov roj argon, tab sis kuj ua rau nws nyuaj rau kev soj ntsuam cov vuam arc thiab vuam ua haujlwm. Yog li ntawd, feem ntau siv nozzle txoj kab uas hla yog feem ntau ntawm 8mm thiab 20mm.

2. Qhov deb ntawm nozzle thiab vuam
Qhov kev ncua deb ntawm lub nozzle thiab lub workpiece yog hais txog qhov kev ncua deb ntawm lub nozzle kawg lub ntsej muag thiab lub workpiece. Qhov me me qhov kev ncua deb, qhov kev tiv thaiv zoo dua. Yog li ntawd, qhov kev ncua deb ntawm lub nozzle thiab lub vuam yuav tsum yog me me li sai tau, tab sis me me heev tsis haum rau kev soj ntsuam lub molten pas dej ua ke. Yog li ntawd, qhov kev ncua deb ntawm lub nozzle thiab lub vuam feem ntau yog coj li 7mm mus rau 15mm.

3. Extension ntev ntawm tungsten electrode
Txhawm rau tiv thaiv lub arc los ntawm overheating thiab hlawv tawm lub nozzle, tungsten electrode tip feem ntau yuav tsum ncua dhau lub nozzle. Qhov kev ncua deb ntawm lub tungsten electrode ntsis mus rau lub nozzle kawg lub ntsej muag yog lub tungsten electrode extension ntev. Qhov me me ntawm tungsten electrode ncua ntev, qhov ze ntawm qhov kev ncua deb ntawm lub nozzle thiab lub workpiece, thiab qhov zoo dua qhov kev tiv thaiv. Txawm li cas los xij, yog tias nws tsawg dhau, nws yuav cuam tshuam qhov kev soj ntsuam ntawm lub pas dej molten.
Feem ntau, thaum vuam pob qij txha, nws yog qhov zoo dua rau cov tungsten electrode kom ntev ntawm 5mm mus rau 6mm; Thaum welding fillet welds, nws yog qhov zoo dua kom muaj tungsten electrode extension ntev ntawm 7mm mus rau 8mm.

4. Txoj kev tiv thaiv roj thiab ntws tus nqi
Ntxiv nrog rau kev siv lub voj voog ncig los tiv thaiv thaj chaw vuam, tungsten inert gas welding tseem tuaj yeem ua rau lub nozzle tiaj tus (xws li qhov sib txawv nqaim tungsten inert gas welding) lossis lwm yam duab raws li qhov chaw vuam. Thaum welding lub hauv paus weld seam, rov qab weld seam ntawm qhov welded ib feem yuav kis tau thiab oxidized los ntawm huab cua, yog li kev tiv thaiv kev nce nqi rov qab yuav tsum tau siv.

Argon thiab helium yog cov roj av uas muaj kev nyab xeeb tshaj plaws los ua kom lub nraub qaum thaum vuam ntawm txhua yam khoom. Thiab nitrogen yog cov roj zoo tshaj plaws rau kev tiv thaiv kev nce nqi rov qab thaum vuam stainless hlau thiab tooj liab alloys. Cov roj ntws ntau npaum li cas rau kev tiv thaiv kev nce nqi ntawm cov roj inert yog 0.5-42L / min.

Kev tiv thaiv huab cua tsis muaj zog thiab tsis muaj txiaj ntsig, thiab nws muaj feem cuam tshuam xws li porosity thiab oxidation ntawm welds; Yog tias huab cua ntws loj dhau lawm, nws yooj yim los ua kom muaj kev kub ntxhov, kev tiv thaiv cov nyhuv tsis zoo, thiab nws tseem yuav cuam tshuam rau qhov ruaj khov combustion ntawm arc.

Thaum inflating cov yeeb nkab fittings, lub qhov hluav taws xob tsim nyog yuav tsum tau sab laug kom tsis txhob muaj roj ntau dhau hauv cov kav dej thaum vuam. Ua ntej qhov kawg ntawm lub hauv paus weld hlaws vuam, nws yog ib qho tsim nyog yuav tsum xyuas kom meej tias cov roj siab hauv cov yeeb nkab tsis siab dhau, txhawm rau tiv thaiv lub vuam pas dej los ntawm lub tshuab los ntawm lub hauv paus los ntawm concave. Thaum siv cov roj argon rau kev tiv thaiv sab nraub qaum ntawm cov yeeb nkab fittings thaum vuam, nws yog qhov zoo tshaj plaws los nkag rau hauv qab, tso cua kom tawm mus rau sab saud thiab khaws cov pa tawm ntawm qhov vuam seam.