1. Yooj yim Oxidation - Cov teeb meem Oxide Film
Kev sib tw:aluminium oxide zaj duab xis (Al₂O₃, melting point txog 2050 degree) yooj yim rau saum npoo ntawm aluminium alloy daim hlau thiab absorbs noo noo. Thaum lub sij hawm welding nws hinders melting ntawm lub hauv paus hlau thiab yooj yim tsim defects xws li pores, slag inclusions thiab tsis tiav fusion, degrading weld kev ua tau zoo.
Kev daws:tshem tawm cov oxide zaj duab xis mechanically (stainless hlau txhuam los yog tshuaj ntxuav) tam sim ntawd ua ntej vuam, siv AC TIG vuam nrog kev tu cov electrode-zoo ib nrab- voj voog, thiab tiv thaiv lub pas dej ua ke nrog argon shielding.
2. Porosity - Hydrogen Solubility Collapse
Kev sib tw:porosity yog qhov tsis xws luag feem ntau hauv aluminium vuam, tshwm sim los ntawm hydrogen. Cov kua aluminium dissolves ntau cov hydrogen thaum cov khoom txhuas dissolves tsawg heev; Thaum lub pas dej molten txias thiab solidifies sai, hydrogen forms pores nyob rau hauv weld.
Kev daws:tshem tawm cov khoom siv hydrogen - qhuav cov xaim xaim thiab cov hlau hauv qab, tshem tawm cov dej noo, roj thiab roj, siv siab - purity argon, thiab tswj vuam ceev kom cov roj yaj tuaj yeem khiav ua ntej solidification.
3. Weld Deformation thiab Kub Cracking
Kev sib tw:aluminium lub thermal expansion coefficient thiab shrinkage yog hais txog ob zaug ntawm cov hlau, thiab nws cov khoom siv dav dav txhawb kev kub tawg. Kev ntxhov siab loj sab hauv los ntawm vuam deformation, ua ke nrog cov txheej txheem tswj, tuaj yeem ua rau thermal tawg.
Kev daws:siv cov kev sib koom ua ke tsim nyog (piv txwv li, ua ntej- lim lossis clamping), tswj cov cua sov tawm tswv yim, welded nrog cov khoom sib xyaw kom haum (piv txwv li 4043 rau 6xxx series) thiab sib txuas welds kom sib npaug shrinkage.
4. High thermal conductivity
Kev sib tw:aluminium ua cua sov kwv yees li peb mus rau plaub zaug zoo dua li cov hlau, yog li vuam aluminium alloy daim hlau siv hluav taws xob ntau dua thiab cov cua sov kis tau sai sai ntawm qhov sib koom ua ke.
Kev daws:siv high-tam sim no, siab- vuam ceev kom mloog zoo rau cov cua sov, preheat tuab ntu, thiab siv lub zog hluav taws xob nrog qhov xav tau tam sim no.
5. Evaporation Loss ntawm Alloy Elements
Kev sib tw:aluminium alloys uas tsis muaj -boiling- cov ntsiab lus (xws li magnesium, zinc thiab manganese) raug kev puas tsuaj loj evaporation nyob rau hauv qhov siab -kub arc, hloov cov tshuaj muaj pes tsawg leeg ntawm cov hlau weld thiab txo qhov kev ua haujlwm vuam.
Kev daws:tswj arc zog thiab vuam ceev kom tsis txhob overheating, siv muab tub lim hlau uas them rau lub caij poob, thiab zam dhau qhov ceev tam sim no.
6. Tsis tshua muaj siab -Tsub muaj zog thiab yas
Kev sib tw:lub zog thiab plasticity ntawm aluminium ntawm qhov kub thiab txias yog tsawg heev; lub vuam hlau tuaj yeem poob nws cov duab, thiab lub pas dej molten yog yooj yim cuam tshuam, ua rau weld sagging los yog vau.
Kev daws:siv cov pas tuav rov qab los yog cov roj rov qab los txhawb cov hauv paus hniav, welding nyob rau hauv txoj haujlwm tsim nyog, thiab tswj lub pas dej molten loj.
Cov ntsiab lus
Aluminium alloy vuam yog xav tau tab sis muaj peev xwm tswj tau tag nrho: ntxuav thiab qhuav ntawm qhov chaw, thaiv nrog argon, tswj cov cua sov, xaiv cov hlau muab tub lim zoo thiab siv cov qauv tsim kom zoo. Siv ua ke, cov kev ntsuas no tsim suab aluminium welds hauv kev tsim khoom.
