A welding method for super duplex stainless steel
A duplex stainless steel, welding method technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve few problems, achieve the effect of improving mechanical properties, beautiful weld shape, and convenient operation
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Embodiment 1
[0014] Embodiment 1 Taking the butt joint of SAF2507 super duplex stainless steel thin-walled pipes with a wall thickness of 8mm as an example, the operation steps are as follows:
[0015] 1) Surface degreasing and derusting treatment is carried out on the butt thin-walled pipes with V-shaped grooves. The groove angle is 68°, the root gap is 2mm, and the blunt edge is 2mm.
[0016] 2) Use ER2594 welding wire with a diameter of 1.2mm for MIG welding, and the shielding gas is pure Ar+2-3%N 2 , the gas flow rate is 12-13L / min, the process parameters are direct reverse connection, the current is 140A, the voltage is 22-23V, the welding speed is 12-13cm / min, and the number of welding layers is three.
[0017] 3) During the welding process, the heat input is controlled at 1.0-1.5KJ / mm, and the interlayer temperature is ≤150°C.
[0018] After welding through the above steps, the austenite phase content in the welded joint is between 45-60%, which balances the phase ratio, improves t...
Embodiment 2
[0019] Example 2 Taking the butt joint of SAF2507 super duplex stainless steel thin-walled pipes with a wall thickness of 10mm as an example, the operation steps are as follows:
[0020] 1) Surface degreasing and derusting treatment is carried out on the butt thin-walled pipes with V-shaped grooves. The groove angle is 70°, the root gap is 2mm, and the blunt edge is 2mm.
[0021] 2) Use ER2594 welding wire with a diameter of 1.2mm for MIG welding, and the shielding gas is pure Ar+2-3%N 2 , the gas flow rate is 13-14L / min, the process parameters are direct reverse connection, the current is 150A, the voltage is 22-23V, the welding speed is 13-14cm / min, and the number of welding layers is four.
[0022] 3) During the welding process, the heat input is controlled at 1.0-1.5KJ / mm, and the interlayer temperature is ≤150°C.
[0023] After welding through the above steps, the austenite phase content in the welded joint is between 45-60%, which balances the phase ratio, improves the ...
Embodiment 3
[0024] Embodiment 3 Taking the butt joint of SAF2507 super duplex stainless steel thin-walled pipes with a wall thickness of 12 mm as an example, the operation steps are as follows:
[0025] 1) The surface of the butt welded plate with V-shaped groove is degreased and derusted. The groove angle is 72°, the root gap is 3mm, and the blunt edge is 2mm.
[0026] 2) Use ER2594 welding wire with a diameter of 1.6mm for MIG welding, and the shielding gas is pure Ar+2-3%N 2 , the gas flow rate is 14-15L / min, the process parameters are direct reverse connection, the current is 160A, the voltage is 23-24V, the welding speed is 13-15cm / min, and the number of welding layers is five.
[0027] 3) During the welding process, the heat input is controlled at 1.0-1.5KJ / mm, and the interlayer temperature is ≤150°C.
[0028] After welding through the above steps, the austenite phase content in the welded joint is between 45-60%, which balances the phase ratio, improves the corrosion resistance, ...
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