Nrog rau txoj kev loj hlob ntawm lub teb chaws kev khwv nyiaj txiag, tuab phab ntsa LSAW steel yeeb nkab nyob rau hauv lub offshore platform, xws li kub thiab siab siab ntawm lub siab lub nkoj, cua yeeb nkab pawg tau lug siv.Kev tsim cov yeeb nkab steel no feem ntau siv D36 steel, S355 steel thiab yog Z rau kev ua haujlwm ntawm steel phaj qauv, phaj thickness, cov ntsiab lus carbon loj dua, thiab cov pa roj carbon ntau sib npaug, tsis zoo weldability, hardening tendency, txo qhov vuam kev ua tau zoo. ntawm welding sib koom ua ke, yooj yim los tsim cov kab nrib pleb txias, tshwj xeeb tshaj yog nyob rau hauv cov kab nrib pleb tshwm sim yog qhov loj dua.Tom qab vuam tawg, ntxiv rau qhov tsim nyog tswj kev ntsuas, tab sis kuj xyuam xim rau lub workpiece los kho lub sijhawm.S355 steel, piv txwv li uas tshwm sim tom qab welding transverse crack kho ntsuas.Qhob yog:

1, paub meej qhov tsis xws luag

100% ntawm tag nrho cov weld ntawm UT tshuaj xyuas, kos qhov chaw ntawm qhov tawg, qhov ntev, qhov tob thiab kev taw qhia.Yog hais tias lub vuam kab yog flawed, thiab hais kom tearing tag nrho cov kab lus submerged arc vuam seam, pom zoo kho lub zos vuam pas nrig arc vuam.

2, ua ntej lub dav hlau preheating

Preheat kub yog 110-170 ℃, preheat kub nrhiav txoj hauj lwm ntawm weld ntawm ob sab ntawm tsis tsawg tshaj li 150 hli, cua sov nyob rau hauv ntau yam rau deb tsis xws luag nyob ib ncig ntawm 500 hli.

3, cua txias

Scope ntawm huab cua gouging tawg tsis xws luag ob xaus rau sab nraud, zoo weld outgoing cua gouging ntawm tsis tsawg tshaj li 50 hli, planer slot ntawm ob qho tag nrho rau du txoj kev hloov, du du nto thiab ntsug kab yam tsawg tshaj li 45 °.Cua gouging carbon pas nrig yuav tsum nyob rau hauv 60 ° Lub kaum sab xis, yuav tuaj txog nyob rau hauv tawg, tshwj xeeb tshaj yog nyob rau hauv lub kaum sab xis me me li sai tau.

4, sib

Txhawm rau kom tsis muaj xim dub, polishing tom qab nto yuav tsum tau hloov pauv, yuav tsum tsis txhob muaj qhov tob tob tob.

5, PT

Tom qab txias rau qhov ntsuas kub kom haum rau kev sim nkag mus (PT).

6, sib

Raws li kev soj ntsuam PT, sib tsoo, polishing kom txog thaum tsis muaj kab liab.

7, Mt

Ua tom qab sib nqus sib nqus particle kuaj (MT), kom paub tseeb tias tsis muaj qhov seem tawg, txwv tsis pub yuav tsum tau polished txuas ntxiv mus, kom txog rau thaum (MT) txhawm rau kuaj xyuas qhov tawg.

8, preheating ua ntej vuam

Pom zoo preheating kub yog 110-170 ℃, preheat kub ntes txoj hauj lwm ntawm weld ntawm ob sab ntawm tsis tsawg tshaj li 150 hli, weld cua sov ntau yam rau qhov deb tsawg tshaj li 500 hli.

9, vuam

Ua raws li cov lus qhia ua haujlwm ntawm kev kho vuam, qhov dav dav dav tsis ntau tshaj 15 hli, tuaj yeem cuam tshuam lawv qhov sib txawv.Los yog siv tau, vuam tsis siv neeg submerged arc vuam txheej txheem.

10, tiv thaiv tshav kub, txias txias tom qab vuam

11, kev kho cua sov tom qab vuam

Kev kho cua sov tom qab vuam feem ntau yog diffusion hydrogen, txhawm rau txo cov kev ntxhov siab uas seem tom qab vuam, rau qhov hnyav dua qhov vuam muaj qhov tshwj xeeb "kev tshem tawm hydrogen", "tshem tawm kev ntxhov siab ntawm kev kho cua sov.Cov txheej txheem ntawm kev kho cua sov yog pom zoo: tam sim ntawd tom qab ua tiav ntawm vuam nrog ceramic electric pam yog rhuab mus rau 200 ℃, lub tshav kub preservation kaw hluav taws xob qeeb txias tom qab 2 h.

12, tom qab vuam xeem

48 teev tom qab vuam ua tiav, NDT xeem, raws li qhov yuav tsum tau ua kom paub meej tias tsim nyog kho.