Submerged-arc welding process for acid-resistant pipe
A submerged arc welding and process technology, applied in arc welding equipment, manufacturing tools, welding equipment, etc., to achieve the effect of reducing production and welding costs, reducing purchase investment, and improving utilization rate
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Embodiment 1
[0021] Take X65MS φ813mmx15.9mm acid-resistant submerged arc welded pipe as an example
[0022] 1. Selection of welding methods and welding materials
[0023] 1. Welding method: use mixed gas Ar+CO 2 After the protection is pre-welded at the root of the outer welding, the inner four-wire submerged arc welding is performed again, and the outer four-wire submerged arc welding is performed once again;
[0024] 2. Welding materials: φ3mmMK·ER50-G welding wire and mixed gas Ar+CO are selected for pre-welding 2 For internal and external submerged arc welding, choose welding wire φ4mm CHW-SH and H08C, the first and second wires are H08C, the third and fourth wires are CHW-SH, and the flux SJ101G. The specific chemical composition of the welding wire is shown in Table 1.
[0025] Wire grade C mn Si S P Cr Ni H08C 0.08 1.65 0.21 0.005 0.009 0.024 0.005 CHW-SH 0.09 1.47 0.12 0.004 0.005 0.12 0.13 Wire grade Cu Nb V Ti Mo Al B ...
Embodiment 2
[0034] Take BMS φ1016mmx12.7mm acid-resistant submerged arc welded pipe as an example
[0035] 1. Selection of welding methods and welding materials
[0036] 1. Welding method: use mixed gas Ar+CO 2 After the protection is pre-welded at the root of the outer welding, there is another inner three-wire submerged arc welding, and one outer three-wire submerged arc welding;
[0037] 2. Welding materials: φ3mmMK·ER50-G welding wire and mixed gas Ar+CO are selected for pre-welding 2 , Internal and external submerged arc welding choose welding wire φ4mmCHW-SH and φ4 / 3mmH08C, one wire is CHW-SH, second wire is φ4mmH08C, third wire is φ3mmH08C, flux SJ101G;
[0038] 2. Welding parameters, pre-welding mixed gas Ar+CO 2The ratio is 4:1, the flow rate is 60L / min, and the welding groove is X-shaped groove. The blunt edge size is 4.5±1.0mm, the inner and outer groove angle is 45±2°, the outer welding groove depth is 4.5±0.5mm, and the inner welding groove depth is 3.7±0.5mm. The weldin...
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