Somo 1Kuchagua TIG dhidi ya MIG kwa kila kiungo: vigezo kwa post-to-baseplate, viunganisho vya handrail, na infill barsInalinganisha TIG na MIG kwa viunganisho vya kawaida vya alumini kama post kwa baseplates, handrails, na infill bars. Inajadili upatikanaji, mwonekano, kiwango cha deposition, na kiwango cha ustadi ili kuongoza uchaguzi wa mchakato na usanidi wa vigezo.
Process comparison: deposition and controlPosts-to-baseplate joint process choiceHandrail and infill bar joint examplesAccess, position, and appearance factorsCost, productivity, and rework trade-offsSomo 2Kasoro za kawaida za welding alumini: porosity, kukosekana kwa fusion, hot cracking — sababu na hatua za kuzuiaInatambua kasoro za kawaida za weld za alumini kama porosity, kukosekana kwa fusion, na hot cracking. Inaunganisha kila kasoro na sababu kama uchafuzi, kufaa vibaya, au pembejeo la joto, na inaonyesha mbinu za ukaguzi na hatua za kurekebisha.
Porosity causes, detection, and preventionLack of fusion from low heat or techniqueHot cracking and solidification controlUndercut and overlap on fillet weldsVisual and NDT checks for aluminum weldsSomo 3Mpangilio na mbinu za welding ili kupunguza mvutano: mkakati wa tack, stitch welding, upande unaobadilishwaInaonyesha jinsi mpangilio wa welding, nafasi ya tack, na muundo wa bead vinavyopunguza mvutano katika alumini. Inashughulikia stitch welding, mbinu za backstep, upande unaobadilishwa, na kusasisha sehemu ili kukabiliana na shrinkage inayotarajiwa.
Tack weld spacing and size for restraintStitch and skip welding on long jointsAlternating sides to balance shrinkageBackstep technique on thin platePresetting and cambering parts before weldSomo 4Muunganisho wa viunganisho na fixtures za clamping: kupunguza mapengo, matumizi ya fixtures za pembe na backingInaelezea jinsi muunganisho wa viunganisho, kufaa, na fixtures za clamping vinavyoathiri mvutano na ubora wa weld. Inashughulikia kupunguza mapengo, kutumia fixtures za pembe, backing bars, na jigs zinazorekebishwa ili kushika alignment wakati wa multi-pass welding ya alumini.
Fit-up tolerances and gap controlAngle fixtures for square and miter jointsUse of backing bars and backing stripsAdjustable jigs for repetitive assembliesPreventing movement during tack and weldSomo 5Aina za sasa na polarity: AC dhidi ya DCEN dhidi ya DCEP na lini kutumia kila mojaInaelezea AC, DCEN, na DCEP kwa welding ya alumini, ikiuunganisha polarity na kitendo cha kusafisha, kupenya, uthabiti wa arc, na joto la elektrodu. Inashughulikia usanidi wa kawaida wa TIG na MIG, mipangilio ya mashine, na jinsi ya kuchagua polarity kwa aina tofauti za viunganisho.
AC balance and cleaning action on aluminum oxideDCEN for specialized aluminum applicationsDCEP effects on tungsten heating and cleaningPolarity selection for TIG vs MIG processesMachine setup checks for correct polaritySomo 6Mazingatio ya pulse welding: faida kwa pembejeo la joto na udhibiti, lini kutumiaInashughulikia kanuni za pulse welding kwa alumini, ikijumuisha sasa la kilele na msingi, mzunguko, na kiwango cha kazi. Inaelezea faida kwa udhibiti wa pembejeo la joto, kazi nje ya nafasi, sehemu nyembamba, na jinsi ya kuchagua programu za pulse au mipangilio ya mkono.
Pulse parameters: peak, background, frequencyBenefits on thin aluminum and gap bridgingUsing pulse for out-of-position weldsSelecting factory pulse programs on power sourcesManual tuning of pulse for specific jointsSomo 7Uchaguzi wa gesi za kinga na viwango vya mtiririko kwa welding ya aluminiInaelezea chaguzi za gesi za kinga kwa TIG na MIG ya alumini, ikizingatia argon, mchanganyiko wa helium, na uchaguzi wa kiwango cha mtiririko. Inashughulikia ukubwa wa pua, ufunikaji wa gesi, ulinzi dhidi ya upepo, na kutatua porosity au sooting kutoka kwa kinga duni.
Pure argon for most aluminum TIG and MIGArgon–helium mixes for thick sectionsTypical flow rates by process and nozzleGas lens, cup size, and stick-out effectsDraft shielding and leak troubleshootingSomo 8Kusafisha interpass na kuondoa oksidi wakati wa weldingInaelezea kwa nini kusafisha interpass ni muhimu kwenye alumini, ikizingatia kuondoa oksidi, uchafuzi wa hydrocarbon, na unyevu. Inalinganisha brashi za stainless, kukata, na kusaga nyepesi, na inafafanua lini na mara ngapi kusafisha kati ya passes.
Aluminum oxide properties and weld impactDedicated stainless steel wire brushingSolvent cleaning and degreasing stepsLight grinding and scraping without gougingCleaning frequency between weld passesSomo 9Vi wango vya kawaida vya vigezo: amperage, kasi ya safari, ukubwa wa elektrodu, mifano ya kipimo cha wayaInatoa viwango vya kuanza vya kawaida kwa amperage, kasi ya safari, ukubwa wa elektrodu, na kipimo cha waya katika TIG na MIG ya alumini. Inasisitiza kurekebisha vigezo kwa unene, aina ya viunganisho, na nafasi huku ikiepuka makosa ya kawaida ya usanidi.
Amperage ranges by material thicknessTravel speed targets for TIG and MIGTungsten diameter and tip preparationWire diameter selection for spray transferParameter adjustment for position changesSomo 10Mkakati wa heat sink na kupoa: chill bars, clamps za muda, pauses za kupoa zilizodhibitiwaInafafanua jinsi heat sinks, chill bars, na clamping vinavyopunguza mvutano na burn-through katika alumini. Inashughulikia backing bars, viatu vya shaba, pauses za kupoa, na fixtures za kupoa kwa maji, na mwongozo wa lini kuruhusu mkusanyiko wa joto uliodhibitiwa.
Chill bar materials and contact requirementsTemporary clamps to control fit-up and warpBacking bars and copper shoes for root supportPlanned cooling pauses between weld passesWater-cooled fixtures and safety concerns