Calculadora de precalentamiento de armaduras D1.4
Consulte el precalentamiento mínimo y la temperatura entre pasadas para soldar barras de acero de refuerzo según AWS D1.4/D1.4M:2018 Tabla 7.2. Introduzca el carbono equivalente (CE) y seleccione el tamaño de la barra.
Use AWS D1.4 Tabla 7.2 para consultar el precalentamiento de barras de refuerzo a partir del carbono equivalente y el tamaño de la barra. La calculadora mantiene las fórmulas de CE de D1.4 separadas de las hipótesis de CE IIW del acero estructural y señala las notas sobre metal base frío, enfriamiento natural y mayor precalentamiento del acero estructural que deben revisarse en taller antes de soldar.
Basado en AWS D1.4:2018 Tabla 7.2 — el precalentamiento de armaduras se remonta a la cláusula.
Preheat Lookup
Applies to SMAW with Bajo Hidrógeno electrodes, GMAW, FCAW, and GTAW. All processes Compartir the same Requisitos.
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 Acero estructural, 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. Al unir barras a acero estructural templado y revenido, se deben cumplir los requisitos de precalentamiento de ambos materiales. Si no pueden cumplirse ambos, no los una mediante soldadura.
Cuando se requiera precalentamiento, caliente toda la sección transversal de la barra hasta la temperatura mínima especificada a lo largo de al menos 6 in [150 mm] a cada lado de la unión. Mantenga temperaturas de precalentamiento y entre pasadas suficientes para evitar grietas.
Cold weather: When the Metal Base 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 Temperatura. 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.