di intanεt strεs we de kכntinyu afta di εnd כf welding εn komplit kol dεm dεn kכl am welding rεsidyual strεs. Welding residual strɛs dɛn de klas lɛk dis:
1. Akɔdin to di tin we mek pɔsin strɛs .
(1) Tεmral strεs: Welding na prכsεs fכ hεt εn kol. Di strɛs we de insay di wɛldmɛnt na di men tin we kin mek i nɔ ivin ɔt ɛn di tɛmpracha difrɛns, we dɛn kin kɔl tɛmral strɛs, we dɛn kin kɔl bak tɛmpracha strɛs.
(2) Ristraint strεs: Di strεs we kכz mεnli bay di strכkchכ insεf כ bay di εksternal rεstrεnt dεm dεn kכl am rεstrεnt strεs.
(3) Faz transfכmeshכn strεs: di strεs we mεnli kכz fכ di כnivεn maykrostrכkchכ transfכmeshכn na di weld jכint εria dεn kכl am fεs transfכmeshכn strεs, we dεn kכl bak maykrostrכkchכ strεs.
(4) Hydrogen-induced concentrated stress: Di strεs we mεnli kכz bay di akyumyuleshכn fכ difכsibul haydrojεn na di maykroskכpik dεfekt dεm dεn kכl am haydrojεn-indyus kכnsantrεt strεs.
pan dεn fכ rεsidyu strεs dεm ya, tεmral strεs de dכminant. So, akɔdin to di tin dɛn we kin mek pɔsin strɛs, dɛn kin sheb am to tu kategori: tɛmal strɛs (tɛmpracha strɛs) ɛn faz transfɔmeshɔn strɛs (tisu strɛs).
2. Akɔdin to di dairekshɔn fɔ strɛs na di spes .
I kin sheb to wan-way strɛs, tu-we strɛs ɛn tri-way strɛs .
(1) Yunidayrekshכnal strεs: Di strεs we de insay wan dεyrekshכn na di weldment dεn kכl am Yunidairekshכnal strεs, we dεn kכl bak layn strεs. Fɔ ɛgzampul, di bɔt wɛld dɛn fɔ wɛld shit ɛn di strɛs we dɛn kin gɛt we dɛn de surface na di say we di wɛldmɛnt de.
(2) Bidirectional stress: Di strεs we de akt pan tu mכtalman pεrpindikul dairekshכn dεm na wan plan fכ di weldment dεm dεn kכl am baydayrekshכnal strεs, we dεn kכl bak plan strεs. i kin apin insay welded strכkchכ dεm fכ mεdiכm εn hεvi plet dεm wit tiknes we de 15-20mm.
(3) Tri-way strεs: Di strεs we de akt insay tri dεyshכn dεm we pεrpindikul to wan an na di weldment dεn kכl am di tri-way strεs, we dεn kכl bak di volyum strεs. Fɔ ɛgzampul, di strɛs we de na di intasekshɔn fɔ di bɔt wɛld fɔ di wɛld tik plet ɛn di wɛl dɛn na tri dairekshɔn dɛn we de pepɛndikul to dɛnsɛf.
Di volyum ekspanshɔn ɛn kɔntrakshɔn fɔ di mɛtal we dɛn ɔt am ɛn kol am na tri dairekshɔn, so strikt wan, di rɛsɛdyual strɛs we dɛn de mek na di wɛldmɛnt na ɔltɛm tri-way strɛs. Bɔt we di strɛs valyu na wan ɔ tu dairekshɔn dɛn rili smɔl ɛn dɛn kin ignore am, dɛn kin tek am as bidirɛkshɔn strɛs ɔ yunidayrɛkshɔn strɛs, ɛn di wan dɛn we de ɔp na di kayn weldin rɛsɛdyual strɛs.
Insay di prodakshɔn prɔses fɔ wɛld paip, strip stɛl nid fɔ kɔmɔt, bɛn, fɔm ɛn weld. Stret go mɔs de insay da tɛm de. Fɔ mek dɛn ebul fɔ gɛt industrial wɛlded paip dɛn wit supia pefɔmɛns, dɛn strɛs ya fɔ dɔn. Na di sem tɛm, we yu tek tɛm tink bɔt di lɔng tɛm kɔst prɛshɔn, i nid fɔ fɛn wan we we go wok fayn ɛn we go sev ɛnaji. Hangao Tech (Seko Machinery) Single-tube energy-saving brait annealing induction heater mashin nɔ kin jɔs pul di strɛs we dɛn dɔn jenarayz di tɛm we dɛn de fɔm di welded tyub dɛn, bɔt i gɛt di kwaliti dɛn bak fɔ sev ɛnaji ɛn fɔ protɛkt di envayrɔmɛnt. We yu kɔmpia am wit di sem kayn prɔdak, di ifɛktiv yutilizeshɔn fɔ ɛnaji na 20%-30% ay. Di kol wata sirkuleshɔn sistɛm kin riliys di risaykul fɔ wata risɔs ɛn kɔntrol di lɔng tɛm kɔst fayn fayn wan.
