Anti-sulfur well mouth valve body welding repair method
A technology of welding repair and valve body, which is applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of structural failure, welding joint joint strength, welding seam composition difficult to meet relevant requirements, and repair difficulty, etc., to achieve high load bearing ability, avoid repeated repair welding rework, and avoid softening problems
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[0031] Example 1
[0032] 1. Clean the product to be repaired, and process one damaged sealing surface, and remove 1.5mm on one side;
[0033] 2. For the two erosion pits, the repair welding pit and the surrounding 20-30mm surface need to be polished to remove rust and oil stains and expose the metallic luster. Clean the polished surface with absolute ethanol or acetone;
[0034] 3. Preheat the whole workpiece to 130℃ before welding;
[0035] 4. Adopt Ar+CO 2 Mixed gas shielded welding is used to fill two pits and fill with 655MPa high-toughness welding wire. The chemical composition of the deposited metal is calculated by mass percentage: C≤0.11%, Si 0.5%~0.9%, Mn 1.4%~1.8%, Cu ≤0.5%, Cr 0.20%~0.6%, Ti≤0.17%, S≤0.025%, P≤0.025%, the balance is Fe; the volume ratio of Ar and CO2 gas is 80%:20%, welding parameters are: filling The diameter of the welding wire is 1.2mm, the welding voltage is 22~26V, the welding current is 200-260A, and the shielding gas flow is 15~22L / min.
[0036] 5. ...
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