AK-S70/ AK-AF207
Standard:
EN ISO ——
AWS A5.23M F69A4-EM4-M4
GB/T 36037 SA FB 1
Characteristics and Applications: Ak-S70 is a submerged arc welding wire for low alloy high strength steel, AK-AF207 is a fluorine-base type sintered flux. The combination of Ak-S70 and AK-AF207 has the advantages of good welding technology, stable arc, easy slag removal and good low temperature impact toughness and crack resistance. Suitable for 700MPa high strength steel welding, commonly used in ships, machinery manufacturing, chemical industry, bridges, steel structures and other low-alloy welding of corresponding strength.
Note:
1. before the use of flux must be 300 ~ 350 ° C baking 1-2 hours, welding wire should be dry before use, no oil, Rust State
2. welding should be strictly removed before the welding area of oil, rust, moisture and other impurities,
3. When welding, preheat 150 ~ 300 ° C (depending on plate thickness and material) .
4. Recommended welding specification (taking Φ4.0 wire as an example) I = 500 ~ 550A, U = 28 ~ 32V, welding speed V = 50 ~ 55cm/min, inter-pass temperature 150 ~ 180 ° C.
5. To ensure the plasticity of deposited metal, it is necessary to dehydrogen at 200 ~ 240 °C for 2 ~ 4 hours after welding.
Flux Quality Requirements:
1. Flux water content ≤0.10%
2. Mechanical inclusions ≤0.30.
3. In flux, flux s 0.050%
4. Flux p content ≤0.060%
Deposited metal x-ray detection requirements: Grade I
Typical Chemical Composition(%):
C:0.028 Si:0.35 Mn:1.60 S:0.006 P:0.010 Ni: 2.01 Cu：0.06 Cr:0.26 Mo:0.44
Mechanical properties of deposited metal:
Tensile strength (MPa) : 690-830
Yield Stress (MPa) : ≥610
Elongation (%) : ≥16
Impact values (J) : ≥27J/-40℃
Recommended :
——
