Wɔ nsɛm a etwa to mu no, yɛasusuw nneɛma a ɛde ba ne nneɛma a wɔde siw dade a ɛnyɛ den a wɔde weld ayɛ a wɔde siw ano no afã horow ho asɛm. Ɛnnɛ, yɛkɔ so hwɛ wɔn a aka no so.
6. Crater .
Wɔfrɛ ɔfã a akɔ fam wɔ weld a ɛwɔ stainless steel welded pipe no awiei no arc crater. Ɛnyɛ sɛ arc crater no ma ahoɔden a ɛwɔ weld a ɛwɔ hɔ no yɛ mmerɛw kɛse nko, na mmom ɛma arc crater mpaapaemu nso ba esiane efĩ a ɛwɔ mu nti.
Nea ɛde ba: Ade titiriw nti a ɛte saa ne sɛ bere a wɔde dum arc no yɛ tiaa dodo; Nsu a ɛreworo so no sõ dodo bere a worebɔ mprɛte a ɛyɛ tratraa no.
Nneɛma a wɔde siw ano: Sɛ electrode arc welding no to mu a, ɛsɛ sɛ electrode no tra ɔtare a ayɛ fĩ no mu kakra anaasɛ ɛtu mmirika wɔ kurukuruwa mu, na afei ɛkɔ ɔfã biako ma edum arc no bere a wɔde dade ahyɛ ɔtare no mu ma no akyi; Sɛ tungsten argon arc welding a, ɛsɛ sɛ ɛwɔ hɔ a ɛdɔɔso sɛ bere a wɔde tra mu no brɛ ase na arc no dum bere a wɔahyɛ weld no ma awie no.
7. Stomata .
Bere a welding sanitary stainless steel welded pipes no, gas a ɛwɔ ɔtare a ayɛ fĩ no mu no ntumi nguan bere a ɛyɛ den no na wɔfrɛ abon a aka a aka no sɛ ɛwɔ pores. Porosity yɛ welding sintɔ a ɛtaa ba, a wobetumi akyekyɛ mu ayɛ no porosity a ɛwɔ mu ne akyi porosity wɔ weld no mu. Stomata yɛ kurukuruwa, ɛyɛ kurukuruwa, ɛte sɛ nkoekoemmoa, ɛte sɛ nea wɔde yɛ ade na ɛyɛ den. Ɛnyɛ sɛ pores a ɛwɔ hɔ no bɛka sɛnea weld no yɛ compact no nko, na mmom ɛbɛtew weld no fã a etu mpɔn no so na atew weld no mfiri su so.
Nea ɛde ba: Ngo, nkannare, nsu ne efĩ afoforo wɔ hɔ wɔ nsu a wɔde hyɛ dade a ɛho ntew a wɔde dade a ɛnyɛ den ayɛ no ani ne ne nsu a ɛyɛ hyew no so; Electrode no a wɔde kata so no yɛ nwini bere a wɔreyɛ arc welding no na wɔmfaa no nwee ansa na wɔde adi dwuma; Arc no yɛ tenten dodo anaasɛ ne fã bi a ɛbɔ, atare a wɔabɔ no a ɛyɛ ɔtare no ho banbɔ nkɛntɛnso no nyɛ papa, mframa no kɔhyɛ ɔtare a ayɛ kusuu no mu; Welding current no korɔn dodo, electrode no yɛ kɔkɔɔ, coating no hwe ase ntɛm, na ahobammɔ tumi no yera; Ɔkwan a wɔfa so yɛ adwuma no nyɛ nea ɛfata, te sɛ arc closing action no yɛ ntɛmntɛm dodo, ɛnyɛ den sɛ wobɛma shrinkage cavity aba, na arc striking action a ɛwɔ joint no mu no nyɛ nea ɛteɛ, a ɛnyɛ den sɛ wobɛyɛ stomata a ɛyɛ den, ne nea ɛkeka ho.
Nneɛma a wɔde siw ano: Ansa na welding no, yi ngo, nkannare, ne nsu a ɛwɔ 20-30mm mu wɔ groove no afanu nyinaa; Bake wɔ kateeyɛ mu sɛnea ɔhyew ne bere a wɔakyerɛ wɔ electrode nhoma no mu no te; Paw welding process parameters no yiye na yɛ adwuma yiye; Fa arc tiawa di dwuma sɛnea ɛbɛyɛ yiye welding, ɛsɛ sɛ afuw mu adansi nya mframa a ɛmma mframa ntumi nkɔ mu; Wɔmma electrode ahorow a enni mu ho kwan, te sɛ welding core corrosion, coating cracking, peeling, excessive eccentricity, ne nea ɛkeka ho.
8. Nneɛma a ɛka ho ne slag a wɔde ka ho .
Nneɛma a wɔde ka ho ne nneɛma a ɛnyɛ dade ne oxide a aka wɔ weld dade a ɛnam dade a wɔde yɛ adwuma so ba no mu. Slag inclusions yɛ slag a wɔabɔ no a ɛda so ara wɔ weld no mu. Wobetumi akyekyɛ stainless steel welded pipe slag inclusions mu abien: Spot slag inclusions ne strip slag inclusions. Slag inclusion no ma weld no fã a etu mpɔn no yɛ mmerɛw, na ɛnam so ma weld no mfiri su so tew. Slag inclusions nso betumi ama stress concentration aba, a ɛnyɛ den sɛ ebetumi asɛe welded nhyehyɛe no bere a wɔde ahyɛ mu no. Nea ɛde ba: Interlayer slag no ho ntew bere a wɔreyɛ welding no; Welding current no sua dodo; Welding ahoɔhare no yɛ ntɛmntɛm dodo; Oprehyɛn no mfata bere a wɔreyɛ welding no; Nnuru a ɛwɔ welding ade no mu ne dade a ɛwɔ ase no nhyia yiye;
Nneɛma a wɔde siw ano: Paw electrode ahorow a ɛwɔ slag yiyi adwumayɛ pa; Fa ahwɛyiye yi interlayer slag no fi hɔ; Paw welding nhyehyɛe parameters a ntease wom; Yɛ nsakrae wɔ electrode angle ne transport kwan no so.
Bere a worepaw A . Welded Pipe Production Line , wubetumi asusuw ho sɛ wode PLC nhyehyɛe a nyansa wom besisi hɔ. Hangao Tech (Seko Machinery) PLC nhyehyɛe no ntumi nhwɛ nneɛma a wɔyɛ ho nsɛm no so wɔ bere ankasa mu nko, na mmom ɛbɛhyehyɛ database a wɔde bɛkora nneɛma a wɔyɛ no so wɔ welded pipes a ɛwɔ nsɛm ahorow a ɛsono emu biara mu, sɛnea ɛbɛyɛ a adeyɛ nhyehyɛe no betumi anya database kyerɛwtohɔ ahorow no bere biara.
9. hyew fa .
Wɔ welding no mu no, dade a ayow no sen fi groove no akyi, na wɔfrɛ perforation defect a ɛwɔ stainless steel welded pipe no mu no, wɔfrɛ no burn-through. Burn-through yɛ sintɔ a ɛtaa ba wɔ arc welding mu no mu biako.
Nea ɛde ba: Welding current akɛse, welding ahoɔhare a ɛyɛ brɛoo, welded pipe no a ɛyɛ hyew dodo; Groove gap kɛse, ano a ɛyɛ mmerɛw dodo a ɛyɛ mmerɛw; Welder oprehyɛn ho nimdeɛ a enye, ne nea ɛkeka ho.
Nneɛma a wɔde siw ano: Paw welding nhyehyɛe no mu nsɛm a ɛfata ne groove kɛse a ɛfata; Ma welder no adwumayɛ ho nimdeɛ tu mpɔn, ne nea ɛkeka ho.
10. Mpaapaemu .
Wobetumi akyekyɛ mpaapaemu a ɛyɛ dade a ɛnyɛ den a wɔde dade a ɛnyɛ den ayɛ no mu mpaapaemu mu ayɛ no mpaapaemu a ɛyɛ nwini, mpaapaemu a ɛyɛ hyew ne mpaapaemu a wɔsan yɛ no hyew sɛnea ɔhyew ne bere a ɛba no te; Wobetumi akyekyɛ mu ayɛ no mpaapaemu a ɛkɔ akyiri, mpaapaemu a ɛtrɛw, ntini mu mpaapaemu, arc crater mpaapaemu, fusion line mpaapaemu ne zone mpaapaemu a ɔhyew ka ho, ne nea ɛkeka ho no mu mpaapaemu yɛ sintɔ a ɛyɛ hu sen biara wɔ welded structures mu, a ɛnyɛ sɛ ɛbɛma nneɛma a wɔde ayɛ no ayɛ basaa nko, na mmom ebia ɛde akwanhyia a anibere wom mpo bɛba.
(1) mpaapaemu a ɛyɛ hyew .
Wɔ welding no mu no, wɔfrɛ welding mpaapaemu a welding seam ne dade a ɛwɔ beae a ɔhyew no aka no ma onwini kosi ɔhyew a ɛkɔ soro a ɛbɛn solidus line no sɛ mpaapaemu a ɛyɛ hyew. Ɛyɛ welding sintɔ a ɛyɛ hu a wɔmma ho kwan. Sɛnea afiri no kyerɛ no, ɔhyew a ɛwɔ afiri a wɔde yɛ nsu mu a ɛyɛ hyew mu no hyew ne ne nsusuwii kyerɛ no, wobetumi akyekyɛ ɔhyew mu mpaapaemu mu ayɛ no mpaapaemu a ɛyɛ kristal, nsu a ɛyɛ hyew a ɛyɛ hyew kɛse ne mpaapaemu a ɛba fam a ɛyɛ hyew a ɛyɛ hyew kɛse.
Nea ɛde ba: Ade titiriw nti a ɛte saa ne sɛ low melting point eutectic ne efĩ wɔ molten pool metal form a ɛyɛ aniberesɛm intragranular ne intergranular segregation wɔ crystallization adeyɛ no mu, ne bere koro no ara mu wɔ welding stress adeyɛ ase. Wɔtwe aburow ahye no mu, na ɛma mpaapaemu a ɛyɛ hyew ba. Mpaapaemu a ɛyɛ hyew taa ba wɔ austenitic stainless steel, nickel alloy ne aluminum alloy mu. Mpɛn pii no, dade a carbon sua no nyɛ mmerɛw sɛ wɔbɛma mpaapaemu a ɛyɛ hyew aba bere a wɔreyɛ welding no, nanso bere a carbon a ɛwɔ dade no mu no kɔ soro no, sɛnea mpaapaemu a ɛyɛ hyew no te no nso kɔ soro. Nneɛma a wɔde siw ano: Di efĩ a epira te sɛ sulfur ne phosphorus a ɛwɔ dade a ɛnyɛ den a wɔde weld ayɛ ne nneɛma a wɔde yɛ welding so no so pɛpɛɛpɛ, tew mpaapaemu a ɛyɛ hyew no so; Yɛ nsakrae wɔ nnuru a ɛwɔ weld dade no mu, ma weld nhyehyɛe no tu mpɔn, siesie aburow no, ma plasticity tu mpɔn, ɛtew anaasɛ ɛpete sɛnea mpaapaemu no te; Fa alkaline welding nneɛma di dwuma na ama efĩ a ɛwɔ weld no mu no so atew na ama mpaapaemu no atu mpɔn; Paw welding nhyehyɛe no mu nsɛm a ɛfata, ma weld forming factor no nkɔ soro sɛnea ɛfata, na fa multi-layer ne multi-pass welding kwan no; Fa mprɛte a wɔde kɔbere gu mu no ara na ɛyɛ dade a ɛwɔ ase no, anaasɛ fa nkakrankakra dum arc no, na hyɛ arc crater no ma na amma ɔhyew mu mpaapaemu a ɛwɔ arc crater no mu.
(2) Mpaapaemu a ɛyɛ nwini .
Wɔfrɛ mpaapaemu a ɛba bere a wɔma welded joint no yɛ nwini kodu ɔhyew a ɛba fam (ma dade a ɛwɔ M. ɔhyew ase) no sɛ mpaapaemu a ɛyɛ nwini. Mpaapaemu a ɛyɛ nwini betumi aba ntɛm ara wɔ welding akyi, anaasɛ ebetumi agye bere bi ( nnɔnhwerew, nna anaa nea ɛboro saa mpo) na apue. Wɔsan frɛ saa mpaapaemu yi a ɛkyɛ. Asiane kɛse.
Nea ɛde ba: Nneɛma a ɛyɛ den a martensite nsakrae de ba, welding residual stress a wɔde ahosodi kɛse no ba, ne hydrogen a aka wɔ weld no mu no ne nneɛma atitiriw abiɛsa a ɛma awɔw ba.
Nneɛma a wɔde siw ano: Paw nneɛma a wɔde hyɛ nsu mu a ɛnyɛ den pii, na tow no pɛpɛɛpɛ sɛnea akwankyerɛ no kyerɛ ansa na wode adi dwuma; Yi ngo ne nsu a ɛwɔ weldments no so ansa na welding, na tew hydrogen a ɛwɔ weld no mu no so; Paw welding process parameters a ntease wom ne ɔhyew a ɛba mu na ama weld seam no ayɛ den; Wɔyɛ hydrogen elimination treatment no bere a wɔayɛ welding no akyi pɛɛ na ama hydrogen no aguan afi welded joint no mu; Wɔ stainless steel welded pipe a ɛwɔ su a ɛyɛ den kɛse ho no, preheating ansa na welding ne ɔhyew ayɛ no wɔ bere mu wɔ welding akyi no betumi ama nkwaa no nhyehyɛe ne ne su atu mpɔn. Mmɔdemmɔ; Fa mfiridwuma ho nhyehyɛe ahorow di dwuma de tew welding adwennwen so.
(3) Mpaapaemu a wɔsan yɛ no hyew .
Wɔ welding akyi no, wɔsan de dade a ɛnyɛ den a wɔde weld ayɛ no hyew wɔ ɔhyew pɔtee bi mu (adwennwen a ɛma ɔhyew no yɛ hyew anaasɛ ɔhyew foforo) na wɔfrɛ mpaapaemu no sɛ ɛpaapae bio.
Nea ɛde ba: Mpɛn pii no, mpaapaemu a ɛba bere a wɔresan ayɛ no hyew no ba wɔ dade a ahoɔden wom a ɛwɔ ahoɔden a ɛba fam, dade a ɛyɛ pearlitic a ɛko tia ɔhyew ne dade a ɛnyɛ den a vanadium, chromium, molybdenum, boron ne nneɛma afoforo a wɔde afrafra wom mu. Wɔ welding thermal cycle akyi no, wɔma ɛyɛ hyew kodu baabi a ɛyɛ mmerɛw (550 ~650°C). Mpaapaemu dodow no ara fi ase wɔ beae a welding no ayɛ a ɛyɛ mmerɛw no. Nneɛma a wɔde san yɛ no mu mpaapaemu dodow no ara ba wɔ dade a ɛnyɛ den a wɔde weld ayɛ ne mmeae a adwennwene wɔ mu no mu, na ɛtɔ mmere bi a, nneɛma a wɔde yɛ no foforo no mu mpaapaemu ba wɔ welding a ɛwɔ ntoatoaso pii mu.
Nneɛma a wɔde siw ano: Wɔ premise a ɛne sɛ wobedu design ahwehwɛde ahorow ho no, paw low-strength welding nneɛma, sɛnea ɛbɛyɛ a weld ahoɔden no bɛba fam sen nea ɛwɔ dade a ɛwɔ ase no mu, na adwennwen no dwo wɔ weld no mu na amma mpaapaemu aba beae a ɔhyew no aka no; Tew welding residual stress ne stress concentration so; Hwɛ welding ɔhyew a ɛwɔ welded paipu no mu, paw preheating ne ɔhyew ayaresa hyew wɔ ntease mu, na kwati beae a ɛyɛ mmerɛw no sɛnea ɛbɛyɛ yiye biara.
