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Electric welding rod for hand welding X80 grade steel oil, gas transmission pipe

A technology of manual welding and conveying pipes, applied in welding media, welding equipment, welding/cutting media/materials, etc., can solve the problems of labor-intensive, material resources, and difficult to meet the requirements of heat treatment.

Active Publication Date: 2009-02-11
ATLANTIC CHINA WELDING CONSUMABLES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, to make the weld seam have such high strength and ensure high enough toughness, it is necessary to heat-treat the weld seam. It takes a lot of manpower and material resources, and due to geographical environment, weather and other reasons, heat treatment is often difficult to meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] This embodiment adopts a welding core with a diameter of Φ4.0mm, and its chemical composition is (%): C 0.040, Mn 0.450, Si 0.021, P 0.010, S 0.005, Cr 0.10, Ni 0.20, Cu 0.010, Fe 99.064, and the balance is Impurities; coating ingredients: CaCO3 Marble powder with content ≥95% 31Kg, CaF 2 20Kg of fluorite powder with content ≥95%, containing K 2 O15%, SiO 2 60%, Al 2 o 3 20% feldspar powder 4Kg, electrolytic manganese 5Kg, commercially pure: titanium dioxide 4Kg, silicon ferrosilicon powder containing 45% Si 6Kg, titanium iron powder 8Kg, molybdenum ferro powder containing 55% Mo 0.6Kg, nickel powder 4Kg, iron powder 15Kg, other elements 2.4 after mixing evenly, add 15Kg potassium sodium water glass with a concentration of 42° and mix evenly, then send it into the plodding machine and wrap it on the welding core, then bake at 100°C for 2 hours, and bake at 380°C for 60 220Kg of welding rods with a length of 400mm and an outer diameter of Φ6.2mm can be produced wit...

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Abstract

The invention relates to an electric welding rod used for manual welding. The electric welding rod comprises core welding-wires containing the following chemical compositions (wt%): 0.020-0.100 of C, 0.350-0.550 of Mn, 0.015-0.030 of Si, 0.005-0.015 of P, 0.002-0.005 of S, 0.01-0.20 of Cr, 0.01-0.30 of Ni, 0.01-0.20 of Cu, 98.675-99.47 of Fe, and the residue of impurity; the electrode coating comprises the following compositions: 28-38 of marble powder, 16-28 of fluorite powder, 2-8 of feldspar powder, 2-7 of white titanium pigment, 4-8 of electrolytic manganese, 3-7 of ferrosilicon powder, 6-9 of ferrotitanium powder, 0.5-2 of ferromolybdenum powder, 3-8 of nickel powder, 10-25 of iron power and 5-8 of other elements. The chemical compositions, the performance and the structure of the welding seam of a grade X80 steel pipe welded by using the electric welding rod are closer to the pipe body, and without heat treatment, the welding seam can meet the requirements on technical indicators such as high strength, high toughness, low hardness and the like of the grade X80 steel pipe used for oil and natural gas transferring; the electric welding rod overcomes the defaults in the prior art that the welding seam is required to be heat-treated after welding, the quality is poor, and engineering accidents are easy to happen when in use and the like.

Description

technical field [0001] The invention relates to an electric welding electrode for welding, in particular to an electric welding electrode for manual welding of X80 grade steel oil and natural gas pipelines, which can be widely used for oil and natural gas transportation of X80 grade steel produced by submerged arc automatic welding It can also be used for welding of X80 grade steel for repair welding of welding defects generated in pipelines. Background technique [0002] Pipeline transportation is the most reasonable transportation method for long-distance transportation of oil and natural gas. It has the remarkable characteristics of economy, safety, high efficiency, energy saving, uninterrupted, and less damage to the environment. Therefore, all countries in the world attach great importance to the development of pipeline transportation technology, and many countries spare no effort to spend a lot of financial and material resources to vigorously develop the pipeline tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/22B23K35/30B23K35/36
Inventor 阳东曾志超陈耕耘郭东李延丰田鹏葛玉宏
Owner ATLANTIC CHINA WELDING CONSUMABLES
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