ASTM B338 GR1 Welded vs Seamless Tube rau Kub Exchanger
May 20, 2026
| Tus nqi qis tshaj | Welded GR1 Tube |
| Tsis muaj weld seam (kev pabcuam tseem ceeb) | Seamless GR1 Tube |
| U- khoov raj nrog lub voj voog nruj | Ob leeg (GR1 welds yog ductile) |
| Kev kub siab lossis kev pabcuam cyclic | Seamless |
| Standard tshav kub exchanger lub luag hauj lwm | Welded (feem ntau) |
| Code stamp xav tau seamless | Seamless |
Rau feem ntau ntawm lub plhaub - thiab - raj kub exchangers, welded raj yog tus qauv xaiv.Nws raug nqi tsawg thiab ua tau zoo. Seamless yog rau cov kev cai tshwj xeeb nkaus xwb.
Qhov txawv yog dab tsi?
Seamless rajyog pierced los ntawm ib tug khoom billet ntawm titanium. Tsis muaj weld seam. Lub raj phab ntsa yog sib xws thiab tsis tu ncua.
Welded rajyog tsim los ntawm titanium sawb, welded longitudinally, ces annealed. Lub weld seam yog tag nrho nkag mus thiab lub raj yog cua sov kho kom rov qab ductility.
| Feature | Seamless | Welded |
|---|---|---|
| Weld seam | Tsis muaj | Longitudinal vuam |
| Tus nqi tsim khoom | Siab dua | Tsawg (15-25% tsawg) |
| Phab ntsa thickness kam rau ua | ±10% | ± 10% (ib yam) |
| Flattening xeem | Yuav tsum tau | Yuav tsum tau |
| Rov qab flattening test | Tsis siv tau | Yuav tsum tau |
| Flaring xeem | Yuav tsum tau | Yuav tsum tau |
| Lub sij hawm ua raws sij hawm (kev cai) | 6-8 lub lis piam | 4-6 lub lis piam |
| Muaj | Zoo | Zoo heev |
ASTM B338 xav tau dab tsi rau txhua tus?
ASTM B338 muaj cov kev xeem sib txawv rau seamless thiab welded raj.
Kev ntsuam xyuas rau seamless raj:
Tshuaj ntsuam xyuas
Tensile xeem
Flattening xeem
Flaring xeem
Hydrostatic los yog eddy tam sim no kuaj
Kev ntsuam xyuas rau welded raj (ntxiv):
Rov qab flattening xeem (weld seam ntawm 90 degrees rau compression)
Weld seam radiography (thaum teev)
Vim li cas qhov rov qab flattening xeem tseem ceeb rau welded raj:
Ib qho piv txwv yog flattened nrog weld seam positioned ntawm 90 degrees mus rau compression kev taw qhia. Qhov no tso siab tshaj plaws ntawm qhov vuam. Yog hais tias lub weld tsis muaj zog, nws tawg. Yog tias nws dhau mus, lub weld muaj zog zoo li lub hauv paus hlau.
U- khoov kev sib piv
| Qhov xwm txheej | Seamless | Welded |
|---|---|---|
| U-khoov tawg tus nqi (zoo dabtsi yog khoov) | <1% | <2% |
| Weld seam tso | Tsis siv tau | Yuav tsum nyob rau nruab nrab axis |
| Yam tsawg kawg nkaus khoov vojvoog (GR1) | 1.5 x OD | 1.5 x OD (ib yam) |
| Tom qab{0}} khoov khoov | Visual los yog dye penetrant | Visual los yog dye penetrant |
Rau welded raj U- khoov, weld seam qhov chaw yog qhov tseem ceeb.
Qhov nruab nrab axis yog kab hauv nruab nrab ntawm qhov khoov qhov twg cov khoom tsis ncab los yog compresses. Weld seam yuav tsum tau muab tso rau ntawm qhov axis. Yog hais tias lub seam nyob rau sab hauv lossis sab nraud, nws yuav ncab los yog compress thiab yuav tawg.
Kev sib piv nqi
Welded tube raug nqi tsawg dua. Cov txheej txheem tsim khoom yog yooj yim dua.
| Ntau | Seamless nqi | Welded nqi | Txuag nrog welded |
|---|---|---|---|
| 100 meters | Lub hauv paus | 15-20% tsawg dua | 500−500−1,000 |
| 1,000 meters | Lub hauv paus | 15-25% tsawg dua | 5,000−5,000−10,000 |
| 10,000 meters | Lub hauv paus | 20-25% tsawg dua | 20,000−20,000−50,000 |
Vim li cas welded yog pheej yig dua:
Pib los ntawm sawb es tsis txhob billet
Tsawg cov khoom pov tseg
Kev ceev ntau lawm ceev
Tsawg zog siv
Thaum xaiv seamless raj
Xaiv seamless thaum:
1. Cov neeg siv khoom spec xav tau seamless.Qee cov neeg siv kawg muaj cov qauv sab hauv uas txwv tsis pub welded raj. Ua raws li cov spec.
2. Kev kub siab lossis kev pabcuam cyclic.Welded tube muaj ib tug weld seam. Txawm hais tias ua tau zoo welded raj muaj zog, seamless tsis muaj seam txhua. Rau cov mob hnyav, seamless yog kev nyab xeeb dua.
3. Code stamped siab lub nkoj.Qee daim ntawv thov ASME code xav tau seamless. Tshawb xyuas koj cov cai yuav tsum tau ua.
4. Cov phab ntsa nyias nyias hauv qab 0.5mm.Nyias phab ntsa welded raj yog ua tau tab sis qee cov fabricators nyiam seamless rau cov ntsuas nyias nyias.
5. Tsis muaj kev ntseeg siab hauv weld seam tso.Yog tias koj lub khw muag khoom khoov tsis tuaj yeem tso siab rau qhov chaw weld seam ntawm qhov nruab nrab axis, seamless tshem tawm qhov kev pheej hmoo.
Thaum xaiv welded raj
Xaiv welded thaum:
1. Tus nqi yog qhov tseem ceeb.Welded txuag 15-25%. Rau feem ntau cov khoom siv hluav taws xob, qhov ntawd yog qhov kev xaiv zoo.
2. Txheem kub exchanger lub luag hauj lwm.Qhov kub thiab txias, nruab nrab siab, huv rau dej brackish. Welded tau siv rau ntau xyoo lawm.
3. U-khoov raj nrog qhov chaw vuam zoo.Ntau txhiab lub tshuab hluav taws xob ua haujlwm nrog welded U-khoov raj. Qhov tseem ceeb yog qhov tseeb weld seam positioning.
4. Lub raj ntev ntev.Welded raj tuaj yeem tsim nyob rau hauv ntev txuas ntxiv dua li seamless.
5. Lub sijhawm ua haujlwm tseem ceeb.Welded raj feem ntau xa nkoj sai, tshwj xeeb tshaj yog rau qhov ntau thiab tsawg.
6. Tsis muaj kev txwv tshwj xeeb rau seamless.Yog hais tias tus spec tsis hais seamless, welded yog txais.
FAQ
1. Puas yog welded raj tso cai los ntawm ASTM B338 rau cov khoom siv hluav taws xob?
Yog lawm. ASTM B338 npog ob leeg seamless thiab welded raj. Welded tube yuav tsum xeem dhau qhov rov qab flattening xeem. Muaj ntau lub tshav kub exchanger raj yog welded.
2. Puas yog welded raj tsis muaj zog dua seamless?
Tsis yog. Ua kom zoo welded raj nrog tag nrho nkag mus thiab annealing muaj weld zog sib npaug rau lub hauv paus hlau. Qhov rov qab flattening test paub tseeb tias qhov no.
3. welded raj puas siv tau rau U- khoov?
Yog lawm. Muab qhov weld seam rau ntawm qhov nruab nrab ntawm qhov khoov. Qhov nruab nrab axis yog qhov uas cov khoom tsis ncab los yog compresses. Ntau txhiab U-khoov cov khoom siv hluav taws xob siv cov welded raj ua tiav.
4. Yuav ua li cas pheej yig dua welded raj dua seamless?
Welded tube raug nqi 15 mus rau 25 feem pua tsawg dua seamless. Rau lub tshuab hluav taws xob loj loj, kev txuag nyiaj tuaj yeem yog kaum txhiab nyiaj.
5. Qhov kev ntsuam xyuas rov qab flattening yog dab tsi?
Ib tug qauv raj yog flattened nrog weld seam ntawm 90 degrees mus rau compression kev taw qhia. Qhov no tso siab tshaj plaws ntawm qhov vuam. Yog tias nws tawg, lub raj tsis ua haujlwm. Yog hais tias nws dhau, lub weld yog suab.
6. Vim li cas seamless nqi ntau dua?
Seamless raj yog pierced los ntawm ib tug khoom billet. Cov txheej txheem qeeb qeeb, siv zog ntau dua, thiab tsim cov khoom pov tseg ntau dua. Welded raj pib los ntawm sawb thiab yog tsim thiab welded tsis tu ncua.
7. Qhov twg yog qhov zoo dua corrosion tsis kam?
Lawv yog tib yam. Ob leeg yog GR1 titanium. Lub hauv paus hlau thiab annealed weld cheeb tsam muaj zoo tib yam corrosion kuj.
8. Kuv tuaj yeem khoov welded raj rau tib lub vojvoog li seamless?
Yog lawm. GR1 welded raj muaj tib yam tsawg kawg nkaus khoov vojvoog ntawm 1.5 npaug OD. Qhov tseem ceeb yog weld seam tso, tsis yog khoov vojvoog nws tus kheej.
9. Yuav ua li cas yog hais tias lub weld seam nyob rau hauv lub voj voog ntawm ib tug U- khoov?
Lub weld seam yuav compress thiab yuav buckle los yog tawg. Lub voj voog sab nraud stretches thiab yuav tawg. Lub vuam yuav tsum nyob rau ntawm qhov nruab nrab axis nkaus xwb.
10. Puas yog daim ntawv pov thawj zeb qhia tias lub raj yog seamless lossis welded?
Yog lawm. Daim ntawv pov thawj zeb yuav hais txog kev tsim khoom. Rau welded raj, nws tseem yuav qhia rov qab flattening xeem.
11. Kuv puas tuaj yeem tau txais welded raj nrog lub vuam seam tshem tawm?
Tsis yog. Weld seam yog ib feem ntawm welded raj. Yog tias koj tsis tuaj yeem lees txais lub vuam seam, yuav seamless.
12. Hom twg muaj ntau dua los ntawm Tshuag?
Welded tube yog feem ntau stocked nyob rau hauv standard heat exchanger qhov ntau thiab tsawg. Seamless kuj muaj tab sis tej zaum yuav muaj sij hawm ntev dua rau cov tsis yog - qhov loj me.
