Cov ntsiab lus tseem ceeb ntawm TIG Vuam Rau Titanium Alloy Pipes

Titanium reacts yooj yim nrog oxygen, nitrogen thiab hydrogen ntawm qhov kub siab tshaj 400 degree, ua rau weld embrittlement, blowholes, tawg thiab lwm yam tsis xws luag. Vim li no, TIG vuam yuav tsum ua raws li cov txheej txheem nruj uas muaj tag nrho - txheej txheem inert roj tiv thaiv, tsis tshua muaj cua sov input thiab huv si.

 

 

Gas Tungsten Arc Vuam (GTAW / TIG) nrog ncaj qha tam sim no electrode zoo (DCEP) yog txoj kev zoo tshaj plaws rautitanium alloy kav.

• Phab ntsa thickness Tsawg dua los yog sib npaug li 3 hli: Tag Nrho TIG vuam
• Phab ntsa thickness ＞ 3mm: TIG thaub qab vuam + MIG sau thiab capping
• Txwv tsis pub nruj: shielded hlau arc vuam (SMAW), CO₂ gas shielded vuam, oxy- roj vuam

 

Cov khoom siv xav tau:

• Nruab nrog siab -frequency arc striking, tam sim no attenuation thiab ncua roj mov functions
• Lub sij hawm xa tawm roj ntau dua lossis sib npaug li 15s
• Cerium tungsten electrodes raug xaiv, nrog lub taub hauv av rau hauv 30℃-45℃cone thiab ib txoj kab uas hla ntawm 1.0-3.0mm

 

 

1. Kev npaj thiab sib dhos

• V-groove feem ntau yog siv, nrog lub kaum sab xis ntawm 60℃-70℃thiab lub hauv paus ntsej muag ntawm 0.5-1.5mm
• Sib dhos qhov sib txawv ntawm 1.0-2.0mm thiab misalignment Tsawg dua los yog sib npaug li 10% ntawm phab ntsa thickness
• Tack welding yuav tsum tau txais tib cov txheej txheem, nrog rau qhov luv luv weld me ntsis thiab kev tiv thaiv txaus; tag nrho cov defects yuav tsum tau muab tshem tawm

 

2. Kev tu kom huv

• Kev tu txhua yam: Tshem tawm oxide nplai nrog stainless hlau hlau txhuam los yog ntawv xuab zeb
• Tshuaj ntxuav: Acetone degreasing → Pickling nrog 5% HF + 35% HNO₃ tov → Yaug nrog dej huv → ziab
• Ua tiav hauv 2 teev ua ntej vuam; roj, dej stains thiab hmoov av yog nruj me ntsis txwv tsis pub
• Cov neeg ua haujlwm yuav tsum hnav hnab looj tes dawb huv thiab tsis raug tso cai kov qhov zawj ncaj qha

 

3. Vuam ib puag ncig

• Cua ceev Tsawg dua lossis sib npaug li 1.5m / s; Kev tiv thaiv cua yog qhov yuav tsum tau ua
• Ambient kub siab dua los yog sib npaug rau 5℃thiab txheeb ze av noo Tsawg dua los yog sib npaug li 60%
• Hauv zos preheating rau 50-100℃hauv qis- qhov kub thiab txias; siab -kub preheating yog txwv tsis pub

 

 

Kev vam meej ntawm titanium alloy vuam yog nyob ntawm kev tiv thaiv argon roj yam tsis muaj lub kaum sab xis tuag.

1. Yuav tsum muaj kev tiv thaiv roj

• Argon purity Ntau dua lossis sib npaug rau 99.99%, nyiam dua 99.995%
• Dew point Tsawg dua lossis sib npaug rau -40℃thiab cov ntsiab lus dej tsawg dua lossis sib npaug li 50mg / m³

 

2. Triple Protection Configuration

• Pem hauv ntej nozzle tiv thaiv: Flow tus nqi ntawm 8-15L / min nrog ib tug loj -inch nozzle
• Backside argon filling tiv thaiv: Flow tus nqi ntawm 5-10L / min; ob sab ntawm qhov zawj tsis pub dhau 150-300mm yuav tsum muab ntim nrog cov ntawv soluble
• Trailing shield tiv thaiv: Ntev Ntau dua lossis sib npaug li 100mm thiab ntws tus nqi ntawm 5–8L / min kom npog qhov siab - qhov kub thiab txias kom txog thaum txias

 

3. Kev tiv thaiv tseem ceeb

• Txuas ntxiv roj tom qab arc extinction kom txog thaum lub vuam kub poob qis dua los yog sib npaug rau 350℃ua ntej txav lub vuam teeb
• Cov hlau kawg yuav tsum nyob twj ywm hauv qhov chaw tiv thaiv txhua lub sijhawm thiab yuav tsum tsis txhob txav tawm
• Interpass kub rau ntau- txheej vuam Tsawg dua lossis sib npaug li 200℃; welding nyob rau hauv lub xeev txias yog pom zoo

 

 

1. Cov ntsiab lus ntawm cov cua kub qis

• Tsis tshua muaj tam sim no, luv luv arc, ceev vuam ceev thiab tsis muaj hluav taws xob oscillation
• Kev tswj cua sov: 6-35kJ / cm
• Tsis txhob coarse grain thiab yas poob

 

2. Hom Parameters (rau kev siv)

• Tungsten electrode txoj kab uas hla: 1.6-2.4mm
• Vuam tam sim no: 50-90A rau thaub qab vuam, 80-140A rau txhaws vuam
• Arc voltage: 10-15V
• Vuam hlau: Homogeneous nrog lub hauv paus hlau (ERTi-2 / ERTi-4 rau TA2 / TC4 feem)

 

3. Kev ua haujlwm tshwj xeeb

• Welding torch inclination lub kaum sab xis: 75℃-85 degree; welding hlau inclination lub kaum sab xis: 10℃-15 degree
• Txo cov lateral oscillation ntawm lub vuam teeb kom tsis txhob ua rau cov ntaub thaiv roj
• Random arc tawm tsam ntawm lub hauv paus hlau nto yog txwv
• Sau lub crater thaum lub sij hawm arc extinction thiab txais yuav tam sim no attenuation los tiv thaiv shrinkage kab noj hniav

 

 

• Silvery dawb yog qhov zoo tshaj plaws weld xim; cov xim tsaus, qhov tsis zoo ntawm kev tiv thaiv:
• Silvery dawb: Tsim nyog
• daj ntseg daj: Tsim nyog
• Tsaus xiav: me ntsis oxidation, siv tau
• Grey/Off-dawb: oxidation hnyav, yuav tsum tau muab txiav tawm thiab rov ua dua

 

 

Oxidation embrittlement

• Ua rau: Kev tiv thaiv tsis ua haujlwm, kub dhau heev
• Countermeasures: Txhim khu kev tiv thaiv triple, txais yuav ncua roj mov, nruj me ntsis tswj interpass kub

Tshuab tshuab

• Ua rau: Roj paug, noo noo, impure argon, tsis zoo txaus tus nqi
• Countermeasures: Kev tu kom huv si, siv siab -purity argon, tuav luv luv arc, txais yuav tus nqi txaus

Txias tawg / Plasticity poob

• Ua rau: Hydrogen embrittlement, coarse grain
• Kev ntsuas ntsuas: nruj me ntsis tswj cov khoom siv hydrogen, siv cov khoom siv hluav taws xob tsawg, ua kom muaj kev ntxhov siab annealing yog tias tsim nyog

 

 

• Kev tshuaj xyuas qhov pom: Tsis muaj kab nrib pleb, lub tshuab nqus tsev, lub qhov lossis oxidation ntawm qhov chaw vuam
• Dye penetrant testing (PT) thiab radiographic testing (RT)
• Sib tsoo cov cheeb tsam oxidized hnyav thiab ua kev kho vuam yog tias tsim nyog
• Nqus annealing tuaj yeem ua rau cov khoom tseem ceeb los txhim kho plasticity thiab stability

 

 

Ruihang Elaborate Material Co., Ltd. muab siab - zoo titanium thiab titanium alloy khoom. Peb cov txheej txheem vuam nruj kom ntseeg tau tias peb ua tau raws li peb cov neeg siv khoom xav tau.Yog xav paub ntxiv, thov hu rau peb ntawm email:Sam.Rui@bjrh-titanium.com