Kalkulator Pemanasan Awal Tulangan D1.4
Cari pemanasan awal minimum dan suhu antar-lintasan untuk pengelasan baja tulangan menurut AWS D1.4/D1.4M:2018 Tabel 7.2. Masukkan karbon ekuivalen (CE) dan pilih ukuran batang.
Gunakan AWS D1.4 Tabel 7.2 untuk mencari pemanasan awal baja tulangan dari karbon ekuivalen dan ukuran batang. Kalkulator ini memisahkan rumus CE D1.4 dari asumsi CE IIW untuk baja struktural, serta menandai catatan tentang logam dasar dingin, pendinginan alami, dan pemanasan awal baja struktural yang lebih tinggi untuk diperiksa di bengkel sebelum pengelasan.
Dibangun berdasarkan AWS D1.4:2018 Tabel 7.2 — pemanasan awal tulangan ditelusuri ke klausulnya.
Preheat Lookup
Applies to SMAW with Hidrogen Rendah electrodes, GMAW, FCAW, and GTAW. All processes Bagikan the same Persyaratan.
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. Untuk menyambung tulangan dengan baja struktural yang dikeraskan dan ditemper, persyaratan preheat kedua bahan harus dipenuhi. Jika keduanya tidak dapat dipenuhi, jangan sambung bahan tersebut dengan pengelasan.
Jika preheat diperlukan, panaskan seluruh penampang batang hingga setidaknya suhu minimum yang ditentukan sepanjang minimal 6 in [150 mm] pada setiap sisi sambungan. Pertahankan suhu preheat dan interpass yang cukup untuk mencegah retak.
Cold weather: When the Logam Induk 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 Suhu. 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.