Q1: Dab tsi yog cov qauv kev sib txuas rau Q235B kav?
A1: Tsib lub hau kev siv: vuam (feem ntau), farged sib txuas), grooved sib txuas (rau kev teeb tsa ceev), thiab tshuab sib xyaw) thiab tshuab. Kev xaiv yog nyob ntawm cov kev xav tau lub zog, kev nkag tau, thiab seb puas muaj kev cuam tshuam dab tsi. Welded pob qij txha muab cov muaj zog tshaj, feem ntau xau sib txuas rau kev teeb tsa tas mus li.
Q2: Yuav ua li cas cov txuj ci vuam pom zoo kom pom zoo rau cov pob qij?
A2: Shielded metal arc welding (SMAW) using E6013 or E7018 electrodes is most versatile for field work. Gas metal arc welding (GMAW) offers higher productivity for larger projects. For critical joints, tungsten inert gas (GTAW) root passes ensure quality. Preheating to 50-100°C is recommended for wall thicknesses >12 hli lossis ambient kub<5°C to prevent cracking.
Q3: Yuav ua li cas yuav tsum npaj cov kev sib txuas tau npaj?
A3: Cov yeeb nkab xaus yuav tsum yog chamfered kom zoo (30-45℃kaum sab xis) ua ntej xov. Xov yuav tsum tau txiav rau ansi b1.20.1 specifications siv ntse tuag. Tom qab xov, tshem tag nrho cov hlau hlau thiab siv xov kab ntawv sib xyaw lossis PVTFE daim kab xev. Siv xov zoo kev koom tes (feem ntau 5-6 tag nrho cov xov rau NPT). Zam kev sib tw ntau dua uas tuaj yeem cuam tshuam cov xov thiab ua rau muaj kev xau.
Q4: Cov kev ntsuas kub rau cov kev sib sib sib sib sib txuas sib txawv li cas?
A4: welded pob qij txha tuaj yeem phim cov yeeb nkab cov kev ntsuas siab tag nrho. Threaded sib txuas yog txwv rau ~ 300 psi rau me me diameters. Flanged sib txuas sib txawv sib txawv los ntawm chav kawm (piv txwv li, chav kawm150=285 psi ntawm 100℃f). Grooved sib txuas feem ntau lis 75% ntawm welded sib tw sib tw. Yuav tsum tau sab laj cov chaw tsim khoom lag luam tshwj xeeb yog cov kev ntsuas txo qis nrog qhov kub nce ntxiv.
Q5: Cov khoom sib txuas tsis sib haum tau li cas?
A5: Cov tswv yim tshwj xeeb suav nrog: siv ob daim hlau uas muaj cov fittings, kev sib cais nrog cov gaskets, lossis cov chaw ua haujlwm tshwj xeeb me nyuam yaus thaum vuam. Rau cov galvanic cov khub niam txiv (piv txwv li, Q235b rau tooj liab), diielic cov unions lossis tiv thaiv cov khaubncaws sab nraud pov hwm tiv thaiv corrosion. Thermal nthuav kev sib txawv yuav tsum tau ua kom haum rau cov qauv tsim los ntawm kev nthuav dav dav lossis txuas txuas.
