Cov txheej txheem ntawm cov welded steel kav yuav tsum dov steel daim hlau los yog ib daim hlab rau hauv qhov xav tau ntawm cov hlaws dai ncaj qha los yog nyob rau hauv ib tug kauv kev taw qhia siv ntau txoj kev tsim. Tom qab ntawd, cov seams tau welded ua ke los ntawm cua sov thiab nias, siv cov txheej txheem vuam sib txawv kom tau txais cov yeeb nkab steel. Yog li ntawd, qhov tsis xws ntawm cov kav hlau welded tuaj yeem muab faib ua ob ntu: weld defects thiab cov khoom siv tsis xws luag.
Weld defects hais txog qhov tsis zoo uas tshwm sim thaum lub sij hawm los yog tom qab fusion vuam nyob rau hauv weld seam. Cov no muaj xws li cov kab nrib pleb, porosity, slag inclusion, incomplete penetration, tsis muaj fusion, undercutting, thiab lwm yam. Ruam porosity thiab sluag inclusion nyob rau hauv weld seam tau faib ua dense volumetric tsis xws luag, ob leeg uas muaj kev phom sij tseem ceeb. Linear slag inclusion thiab incomplete penetration yog categorized li linear defects, kuj ua rau muaj kev pheej hmoo loj heev. Porosity thiab me me slag inclusions, ntawm qhov tod tes, yog qhov tsis xws luag.
Qhov tsis xws luag nyob rau hauv weld seam yog feem ntau yuav ua rau muaj teeb meem nrog lub zog thiab plasticity ntawm cov kav hlau steel, cuam tshuam rau lawv qhov zoo. Tsis tas li ntawd, qhov zoo ntawm welded steel kav ncaj qha cuam tshuam rau kev nyab xeeb kev ua haujlwm thiab kev pabcuam lub neej ntawm cov kav dej thiab roj. Yog li ntawd, kev soj ntsuam vuam feem ntau tsom rau kev kuaj xyuas qhov tsis zoo xws li tawg, porosity, slag suav nrog, tsis tiav kev nkag mus, thiab tsis muaj fusion nyob rau hauv weld seam.
Qhov tsis xws luag hauv cov phaj steel, tom qab cov txheej txheem zoo li dov, feem ntau tshwm sim raws li cov qauv tsis xws luag, sib npaug rau saum npoo. Cov teeb meem tseem ceeb suav nrog lamination, suav nrog, kab nrib pleb, thiab quav, nrog lamination yog qhov tsis xws luag sab hauv. Lamination tuaj yeem ua rau muaj ntau yam kab nrib pleb, thiab thaum lub phaj raug tensile kev nyuaj siab perpendicular rau saum npoo, nws cuam tshuam rau lub zog ntawm cov yeeb nkab steel, ua rau nws tsis txaus ntseeg.
