Chemical Composition Requirements
1. Kev soj ntsuam cov khoom tiav ntawm cov phaj - Cov chaw tsim khoom ntawm cov yeeb nkab yuav tsum txheeb xyuas txhua qhov kub ntawm cov phaj. Kev soj ntsuam cov khoom tiav yog li txiav txim siab yuav tsum ua raws li cov kev xav tau ntawm cov qauv phaj rau cov yeeb nkab xaj.
2. Kev soj ntsuam cov khoom tiav ntawm Welds - Cov chaw tsim khoom ntawm cov yeeb nkab yuav tsum ua tiav cov khoom ntsuas ntawm txhua 500ft (152m) los yog seem ntawm cov khoom tiav weld. Kev txheeb xyuas muaj pes tsawg leeg yuav tsum ua raws li cov txheej txheem welding siv rau cov khoom siv vuam hlau.
3. Kev tshuaj xyuas tej zaum yuav ua rau cov khoom siv kho tshuab. Cov txiaj ntsig ntawm kev txheeb xyuas yuav tsum raug qhia rau tus neeg yuav khoom.
4. Thaum soj ntsuam raws li tau teev tseg hauv 1 lossis 2, yog tias ib qho ntawm cov qauv tsis ua raws li qhov yuav tsum tau ua, ob npaug ntawm cov kav dej qub yuav tsum tau muab coj los ntawm tib batch thiab reanalyzed; txhua tus ntawm lawv yuav tsum ua raws li qhov yuav tsum tau ua. Cov kav dej tsis tsim nyog yuav raug tso tseg.
Mechanical Property Requirements
1. Tensile Properties:
- Yuav tsum tau-Cov khoom siv tensile transverse ntawm welded pob qij txha yuav tsum tau raws li qhov tsawg kawg nkaus yuav tsum tau rau qhov kawg tensile lub zog ntawm lub phaj teev. Tsis tas li ntawd, rau Chav Kawm 3x, 4x, thiab 5x ntawm Dxx, Hxx, Jxx, thiab Nxx, cov khoom sib hloov tensile ntawm cov khoom siv niam txiv (phaj) yuav tsum txiav txim siab ntawm cov qauv txiav los ntawm cov yeeb nkab uas muaj cua sov. Cov khoom no yuav tsum ua kom tau raws li cov khoom siv ntsuas kev ntsuas ntawm cov qauv phaj.
- Number of Tests-Ib tug neeg sawv cev qauv yuav tsum tau npaj rau txhua batch ntawm tiav steel yeeb nkab.
- Specimen Location and Orientation-Cov qauv yuav tsum hloov mus rau qhov vuam ntawm qhov kawg ntawm cov yeeb nkab steel tiav thiab tej zaum yuav txias flattened ua ntej zaum kawg machining kom loj.
- Test Method-Cov qauv yuav tsum tau npaj ua raws li QW-150 ntawm Tshooj 6 ntawm ASME rauv thiab Siab Vessel Code thiab cov qauv yuav tsum tau kuaj nyob rau hauv chav tsev kub raws li A370 Txoj Kev thiab Cov Lus Txhais.
Transverse Guided Khoov Test ntawm Welds:
- Yuav tsum tau-Qhov kev ntsuam xyuas khoov yog qhov txaus siab yog tias tus qauv, tom qab khoov, tsis muaj qhov tawg lossis lwm yam tsis xws luag tshaj 1/8 hauv (3.2 hli) nyob rau hauv ib qho kev taw qhia, tshwj tsis yog nyob rau hauv lub vuam hlau los yog nruab nrab ntawm lub vuam thiab cov niam txiv hlau. Cov kab nrib pleb tshwm sim raws li cov npoo ntawm cov qauv thaum lub sij hawm ntsuas thiab ntsuas tsawg dua 1/4 hauv (6.4 mm) nyob rau hauv ib qho kev taw qhia yuav tsum tsis txhob suav hais tias yog tsis txaus siab.
- Number of Tests-Ib qho kev xeem (ob tus qauv) yuav tsum tau ua rau txhua qhov ntau ntawm cov yeeb nkab tiav los sawv cev rau ntau.
- Qhov chaw thiab kev taw qhia ntawm Specimens-Ob qhov khoov specimens yuav tsum tau muab transverse mus rau lub vuam ntawm qhov kawg ntawm cov yeeb nkab tiav. Lwm txoj hauv kev tuaj yeem pom zoo los ntawm tus neeg yuav khoom thiab cov chaw tsim khoom kom tau txais los ntawm cov ntawv xeem ntawm cov khoom siv tib yam li cov yeeb nkab, uas yuav tsum tau welded mus rau qhov kawg ntawm lub tog raj kheej thiab welded raws li kev txuas ntxiv ntawm qhov ntev ntawm cov yeeb nkab. .
- Test Method-Cov kev cai xeem ntawm A2.5.1.7 ntawm A370 yuav tsum tau ua. Rau cov yeeb nkab nrog phab ntsa thickness ntau dua 3/8 hauv (9.5 mm) tab sis tsawg dua 3/4 hauv (19.0 mm), qhov kev ntsuas sab khoov tuaj yeem hloov pauv rau kev xeem lub ntsej muag thiab nraub qaum. Rau phab ntsa thickness> 3/4 nyob rau hauv, ob qho tib si qauv yuav tsum raug rau sab khoov xeem.
