1. Tshuaj muaj pes tsawg leeg ntawm cov khoom siv hauv paus: 45 # steel yog cov pa roj carbon nruab nrab. Qhov kev ua tau zoo ntawm cov pa roj carbon steel yuav hloov pauv nrog qhov nce ntawm cov ntsiab lus carbon. Qhov tuab ntawm cov yeeb nkab phab ntsa, qhov siab dua cov ntsiab lus carbon. Nyob rau hauv qhov kev txiav txim ntawm welding thermal voj voog, Hardened cov ntaub so ntswg yog tsim nyob rau hauv ze suture cheeb tsam. Lub xeev nkig no ua ke nrog kev ntxhov siab loj yuav ua rau cov kab nrib pleb txias hauv thaj tsam ze-seam.
2. Txo cov diffusible hydrogen cov ntsiab lus ntawm cov hlau weld: Thaum lub sij hawm welding, lub weld cheeb tsam absorbs hydrogen. Hydrogen yog cov dej noo uas muaj nyob rau hauv cov khoom siv vuam thiab cov roj, xeb, thiab lwm yam ntawm cov khoom siv hauv paus. Nws decomposes rau hauv hydrogen atoms nyob rau hauv lub siab kub ntawm lub arc thiab dissolves nyob rau hauv lub vuam pas dej ua ke. Raws li qhov kub thiab txias, solubility ntawm hydrogen txo qis sharply. Txij li thaum qhov sib koom ua ke txias sai heev, thaj chaw weld kuj tuaj yeem saturated nrog yaj argon. Hydrogen khiav tawm thiab sau ntawm qee qhov tsis xws luag, thiab cov hydrogen hauv cov hlau tseem yuav ua rau kev ua haujlwm tsis zoo.
3. Kev npaj ua ntej welding: Nco ntsoov siv cov welding low-hydrogen rods rau grooves thiab bevels ua ntej welding. Qhuav ua ntej welding ntawm qhov kub thiab txias ntawm 350 degrees thiab ua kom sov li 2 teev. Thaum siv, nws tau ntim rau hauv lub vuam pas nrig thiab ua kom sov txhua lub sijhawm kom txo tau cov ntsiab lus hydrogen hauv vuam pas nrig. Ua ntej welding, preheat ob nets ntawm lub vuam zawj. Qhov kub preheating yog 250 degrees.
Yog hais tias cov kab nrib pleb tshwm thaum lub sij hawm vuam, re-weld. Txhua qhov sib txuas yuav tsum tau txuas txuas txuas ntxiv ntawm ib zaug.
