D1.4 철근 예열 계산기
AWS D1.4/D1.4M:2018 표 7.2에 따라 철근 용접의 최소 예열 온도와 패스 간 온도를 조회합니다. 탄소 당량(CE)을 입력하고 철근 호칭 크기를 선택하세요.
AWS D1.4 표 7.2를 사용하여 탄소 당량과 철근 크기로 철근 예열을 조회합니다. 이 계산기는 D1.4의 CE 식을 구조용 강재의 IIW CE 가정과 분리하여 다루며, 용접 전 현장에서 확인해야 할 저온 모재, 자연 냉각, 구조용 강재 쪽의 더 높은 예열 관련 주의 사항을 알려 줍니다.
AWS D1.4:2018 표 7.2 기반 — 철근 예열은 해당 조항까지 추적됩니다.
Preheat Lookup
Applies to SMAW with 저수소 electrodes, GMAW, FCAW, and GTAW. All processes 공유 the same 요구사항.
Per AWS D1.4:2018
Clause 7.2.1: minimum preheat and interpass temperatures are in accordance withTable 7.2, using the highest CE fromClause 1.5.4.
D1.4 Table 7.2 Preheat Lookup
SMAW with low-hydrogen electrodes, GMAW, FCAW, or GTAW. When welding rebar to structural steel, also check D1.1 preheat requirements and use the higher value.
Enter carbon equivalent and bar size above to see the applicable preheat result.
D1.4 Preheat Requirements
Rebar to structural steel: When steel reinforcing bars are welded to structural steel, the preheat requirements of D1.1 also apply. Use the higher preheat requirement of D1.4 Table 7.2 and D1.1 Table 5.11. Extreme caution is needed when welding rebar to quenched and tempered steels. 철근을 담금질 및 뜨임한 구조용 강재에 접합할 때는 두 재료의 예열 요건을 모두 충족해야 합니다. 두 요건을 함께 충족할 수 없으면 용접으로 접합하지 마십시오.
예열이 필요한 경우 접합부 양쪽에서 각각 최소 6 in [150 mm] 길이에 걸쳐 철근의 전체 단면을 규정된 최저 온도 이상으로 가열하십시오. 균열을 방지할 수 있는 예열 및 층간 온도를 유지하십시오.
Cold weather: When the 모재 is below 32°F (0°C), preheat to at least 70°F (20°C) and maintain during welding.
Cooling: After welding, bars must cool naturally to ambient 온도. Accelerated cooling is prohibited.
Carbon equivalent: For bars other than ASTM A706/A706M, use CE = C + Mn/6. For ASTM A706/A706M, use CE = C + Mn/6 + Cu/40 + Ni/20 + Cr/10 - Mo/50 - V/10. When chemical composition is not available, see D1.4 Clause 1.5.4. Use our Carbon Equivalent Calculator to compute CE from MTR data.
D1.4 Rebar Preheat FAQ
AWS D1.4:2018 Clause 1.5.4 uses two formulas, not the IIW formula. For bars other than ASTM A706/A706M, CE = C + Mn/6. For ASTM A706/A706M, CE = C + Mn/6 + Cu/40 + Ni/20 + Cr/10 - Mo/50 - V/10. Table 7.2 then maps CE and bar size to preheat.
Table 7.2 covers SMAW with low-hydrogen electrodes, GMAW, FCAW, and GTAW. All four processes share the same preheat requirements — unlike D1.1, D1.4 does not differentiate preheat by welding process. Non-low-hydrogen SMAW is not addressed in this table.
When reinforcing bars are welded to structural steel, both D1.4 Table 7.2 and D1.1 Table 5.11 apply. Use the higher preheat requirement of the two tables. If the structural steel requires a higher preheat than the rebar, that higher temperature governs. Extreme caution is needed when welding rebar to quenched and tempered steels.
When Table 7.2 shows 'none', no minimum preheat temperature is required for that combination. However, if the base metal temperature is below 32°F (0°C), you must still preheat to at least 70°F (20°C) and maintain that temperature during welding. After welding, bars must cool naturally — accelerated cooling is prohibited.