1. Weldabilas Feem
Q295gnhgh: Txo cov pa hluav taws xob sib npaug (CEQ ≈ ≈ 0.30-0.35%) vim nws cov roj carbon qis thiab cov ntsiab lus alloy. Qhov no muab nws zoo dua weldability, nrog qis kev pheej hmoo ntawm kev tawg txias thiab tsawg rhiab rau cov lus tawm tshiab.
Q355NH: Ntau dua cov pa roj carbon sib npaug (CEQ ≈ ≈ 0.38-0.45%) vim muaj cov pa roj carbon thiab nce ntxiv (piv txwv li, mn, cr) kom ua tiav lub zog siab dua. Qhov no nce nws qhov kev ua tau ntxim yuav txias thiab xav tau kev tswj hwm kev coj ua ntawm preheating thiab tshav kub.
2. Yuav Tsum Tau Ua Ntej
Feem ntau yuav tsum tsis muaj preheating rau cov seem nyias (<12mm) under normal ambient conditions (above 15°C).
For thicker sections (>12 hli) lossis qis -} qhov chaw ib puag ncig (<5°C), preheating to 50–100°C may be recommended to reduce hydrogen-induced cracking.
Mandatory preheating for most applications, especially for thicknesses >8 hli lossis hauv ib puag ncig txias.
Cov preheering kub: 80-150℃(siab dua rau cov phiaj thicker lossis cov pob qij txha siab kom qeeb thiab tso cai rau hydrogen diffusion).
3. Thaum tshav kub kub tswj
Pom zoo kom sov tawm tswv yim: 15-35 KJ / CM (nyob ntawm cov tuab tuab).
Pom zoo kom sov tawm tswv yim: 15-25 KJ / CM (sib zog los tiv thaiv ntau yam kom tiv thaiv ntau dhau ntawm Haz muag muag lossis embrittlementlement).
4. Muab Too Hlau Xaiv Kev Xaiv Hlau
Cov hlau ua cov tub lim txuam nrog nws cov cua ntau thiab lub zog: piv txwv li, e7018-g (rau huab cua) lossis E6013 (rau cov qauv kev siv dav dav).
Tsom rau kev tswj hwm corrosion tsis kam nyob rau hauv weld hlau, feem ntau xav tau cov fillers nrog CU, lub zawj.
Yuav tsum tau siab dua {- lub zog fillers kom phim nws lub hauv paus hlau lub zog:} g (flux-cored, rau siab dua lub zog).
Tseem ceeb rau kev sib npaug lub zog thiab tawv hauv weld, raws li under - Cov plob ua tsis tiav hauv kev ua haujlwm weld.
5. Post - Weld Kev Kho Tshav Kub (PWHT)
6. Kev Tiv Thaiv Nris
Q295gnhgh: Lub ntsiab lus kev txhawj xeeb yog hydrogen cracking hauv cov kab tuab; hais los ntawm tsawg - hydrogen electrodes (piv txwv li, e7018-g) thiab minimal preheating.
Q355NH: Cov kev pheej hmoo siab ntawm cov kev tawg txias vim yog cov ntau dua cov pa roj carbon ntau dua thiab cov ntsiab lus. Yuav tsum muaj:
Nruj medogen tswj (qis - hydrogen fillers, qhuav electrodes).
Txaus prehishing preheating thiab sib txuam kub (ntau dua lossis sib npaug ntawm 150℃rau cov ntu tuab).
Tshaj tawm - Weld Qeeb Kub (piv txwv li, rwb thaiv tsev) kom tso cai rau hydrogen khiav dim.
