Prewelding method of thin-wall longitudinal submerged-arc welded (LSAW) pipes with small bore diameter
A straight seam submerged arc and small-diameter technology, which is applied in the field of steel welding, can solve the problems of reducing the welding pass rate, the pre-weld seam is not full, and the welding seam repair rate increases, so as to reduce the number of pre-welding arc stop adjustments and improve The effect of one-time molding rate and shortened repair length
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0014] The selected steel pipe specification is φ457X8.8mm steel grade L360MS, the pre-welding uses φ2.0mm gas shielded welding wire, and uses CO 2 Pre-weld with Ar mixed gas shielded automatic welding, welding current is 430A, welding voltage is 25V, welding wire elongation is 24mm, welding wire inclination is 0°, welding speed is 2.2m / min, shielding gas is 18% CO 2 +82% Ar, gas flow rate 25L / min.
[0015] Prepare the groove, and grind the groove and both sides of the inner and outer walls until the metallic luster is exposed, and then adopt gas shielded automatic welding for the counter pre-welding. The pre-welded seam obtained is full, smooth and uniform, and the inner groove has almost no welding tumor . 0% of internal welding burn-through defects, 0% of internal welding partial defects; the time consumption of each pre-welding repair process is reduced from 25min when using φ2.4mm gas shielded welding wire to 15min, and the production efficiency is reduced from φ2.4mm ga...
Embodiment 2
[0017] The selected steel pipe specification is φ406X11mm steel grade L360MS, the pre-welding uses φ2.0mm gas shielded welding wire, the welding current is 480A, the welding voltage is 26V, the elongation of the welding wire is 24mm, the inclination angle of the welding wire is 0°, and the welding speed is 1.8m / min , protective gas 18%CO 2 +82% Ar, gas flow rate 20L / min.
[0018] Prepare the groove, and grind the groove and both sides of the inner and outer walls until the metallic luster is exposed, and then adopt gas shielded automatic welding for the counter pre-welding. The pre-welded seam obtained is full, smooth and uniform, and the inner groove has almost no welding tumor . 0% of internal welding burn-through defects, 0% of internal welding partial defects; the time consumption of each pre-welding repair process is reduced from 20min when using φ2.4mm gas shielded welding wire to 14min, and the production efficiency is reduced from φ2.4mm gas shielded welding wire Ste...
Embodiment 3
[0020] The specification of the selected steel pipe is φ559X6.4mm steel grade L360M, the pre-welding uses the gas shielded welding wire of φ2.0mm, the welding current is 400A, the welding voltage is 27V, the elongation of the welding wire is 25mm, the inclination angle of the welding wire is 0°, and the welding speed is 2.9m / min, protective gas 18%CO 2 +82% Ar, gas flow rate 40L / min.
[0021] The theoretical groove width of the external welding of 6.4mm wall thickness steel pipe is 3.8mm. If φ2.4mm and φ3.2mm welding wires are used, the pre-welding automatic welding equipment cannot produce normally, and the steel pipe can only be pre-welded manually by semi-automatic gas-shielded welding, 8 hours The shift produces 10 to 12 roots. After adopting the gas shielded welding wire of φ2.0mm, the pre-welding is automated, the pre-weld seam is full, smooth and uniform, and there is almost no welding bump in the inner groove. Internal welding burn-through defects are 0%, internal w...
PUM
Property | Measurement | Unit |
---|---|---|
elongation | aaaaa | aaaaa |
thickness | aaaaa | aaaaa |
elongation | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com