수고 많으십니다.
A182-F22.CLASS 3 재질과 A182-F91 재질을 용접하려 하는데
용접봉을 A182-F22 용접에 사용하는 봉으로 사용하려 합니다.
이에 따른 문제점(CRACK 등)이 발생할 수 있는지요??
아니면 서로 다른 재질이므로 다른 용접봉을 선택하여야 하는지요?
[Recommended Practice to Prevent Crack during/after Welding]
1. Filler Metal: 2 1/4Cr-1Mo base (e.g., E9018-B3)-But, the chemical composition control is required; X = (10P+5Sb+4Sn+As)/100 </15 [element unit; ppm] and low hydrogen (H4 for SMAW, H5 for FCAW & SAW flux)
2. Preheating Temperature: 400 to 500 deg.F (204 to 260 deg.C)
3. Interpass Temperature (to prevent hot crack due to Si & Nb): max 600 deg.F (316 deg.C)
4. Post Weld for Baking Out: min. 4 hours at the preheating temperature
5. PWHT @ 1350 deg.F (732 deg.C) per Codes-Sufficient thermocouples are required to minimize temperature gradients each parts (max.different temperature; 100 deg.F = 56 deg.C)
6. RT: Full per Code
7. Hardness Requirement on Weldment: </240 HBN for SMAW, </260 HBN for SAW, GTAW, FCAW
8. Impact Test Requirement if needed
1. Filler Metal: 2 1/4Cr-1Mo base (e.g., E9018-B3)-But, the chemical composition control is required; X = (10P+5Sb+4Sn+As)/100 </15 [element unit; ppm] and low hydrogen (H4 for SMAW, H5 for FCAW & SAW flux)
2. Preheating Temperature: 400 to 500 deg.F (204 to 260 deg.C)
3. Interpass Temperature (to prevent hot crack due to Si & Nb): max 600 deg.F (316 deg.C)
4. Post Weld for Baking Out: min. 4 hours at the preheating temperature
5. PWHT @ 1350 deg.F (732 deg.C) per Codes-Sufficient thermocouples are required to minimize temperature gradients each parts (max.different temperature; 100 deg.F = 56 deg.C)
6. RT: Full per Code
7. Hardness Requirement on Weldment: </240 HBN for SMAW, </260 HBN for SAW, GTAW, FCAW
8. Impact Test Requirement if needed
Hope it helps,
Thomas J.C. Eun