Low-hydrogen alkaline electrode for online welding of X80 pipeline steel

A basic welding rod and pipeline steel technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problem of no X80 pipeline steel, etc., and achieve fine and beautiful weld formation and hydrogen content of deposited metal diffusion Good effect on control and arc stability

Inactive Publication Date: 2013-01-16
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a low-hydrogen alkaline electrode for on-line welding of X80 pipelin

Method used

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  • Low-hydrogen alkaline electrode for online welding of X80 pipeline steel
  • Low-hydrogen alkaline electrode for online welding of X80 pipeline steel
  • Low-hydrogen alkaline electrode for online welding of X80 pipeline steel

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0056] The present invention also provides a kind of preparation method of welding rod, implement according to the following steps:

[0057] Step 1, make solder core

[0058] 3) Place professional pure iron and industrial pure iron in the center of the crucible, spread graphite, ferromanganese, ferrosilicon, ferromolybdenum and bornite around the inner wall of the crucible, then spread Ni powder in the middle of the crucible, and then place The Ni powder is covered with graphite, ferromanganese, ferrosilicon, ferromolybdenum and bornite. Put the crucible and the contents in the crucible into an induction furnace for smelting. All the contents in the crucible are melted to form molten alloy steel. When the temperature reaches 1540°C and the molten steel is calm, stop heating, cool and exhaust for 15 minutes, then heat and refine for 20 minutes, then stop heating, and add Ti powder when the temperature of alloy steel liquid drops to 1550°C, when the temperature of alloy steel li...

Embodiment 1

[0067] Make solder core

[0068] Place professional pure iron and industrial pure iron in the center of the crucible, spread graphite, ferromanganese, ferrosilicon, ferromolybdenum and bornite around the inner wall of the crucible, then spread Ni powder in the middle of the crucible, and then spread Ni powder The top is covered with graphite, ferromanganese, ferrosilicon, ferromolybdenum, and bornite. Put the crucible and the contents in the crucible into an induction furnace for smelting. All the contents in the crucible are melted to form molten alloy steel. The temperature of the molten alloy steel reaches 1540°C, and when the molten steel is calm, stop heating, and cool and exhaust for 15 minutes, then heat and refine for 20 minutes, then stop heating, and add Ti powder when the temperature of the molten alloy steel drops to 1550°C, 5 minutes before the temperature of the molten alloy steel drops to 1540°C Fill in argon gas to make the pressure in the furnace reach 300mmHg...

Embodiment 2

[0082] Make solder core

[0083] Place professional pure iron and industrial pure iron in the center of the crucible, spread graphite, ferromanganese, ferrosilicon, ferromolybdenum and bornite around the inner wall of the crucible, then spread Ni powder in the middle of the crucible, and then spread Ni powder The top is covered with graphite, ferromanganese, ferrosilicon, ferromolybdenum, and bornite. Put the crucible and the contents in the crucible into an induction furnace for smelting. All the contents in the crucible are melted to form molten alloy steel. The temperature of the molten alloy steel reaches 1540°C, and when the molten steel is calm, stop heating, and cool and exhaust for 15 minutes, then heat and refine for 20 minutes, then stop heating, and add Ti powder when the temperature of the molten alloy steel drops to 1550°C, 5 minutes before the temperature of the molten alloy steel drops to 1540°C Fill in argon gas to make the pressure in the furnace reach 350mmHg...

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Abstract

The invention discloses a low-hydrogen alkaline electrode for online welding of X80 pipeline steel. The low-hydrogen alkaline electrode comprises a core wire and a coating. The coating comprises, by weight, from 40% to 45% of marble, from 15% to 20% of fluorite, from 2% to 4% of titanium dioxide, from 6% to 10% of rutile, from 7% to 10% of ferrotitanium, from 4% to 7% of low-carbon ferromanganese, from 2% to 5% of ferrosilicon, from 6% to 10% of iron powder, from 2.5% to 3% of synthetic mica, from 1.8% to 2.2% of rare earth and from 2% to 2.4% of microcrystal fibers, and the sum of the weight percents of the components is 100%. The electrode made from the coating is good in arc stabilization performance, a molten pool is good in flowability, splashing particles are tiny, post-welding slag detachability is good, slag coverage is uniform, and formed weld joints are delicate and attractive. Besides, the content of diffusible hydrogen in deposited metal of the manufactured electrode is effectively controlled.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a low-hydrogen alkaline electrode for online welding of X80 pipeline steel. Background technique [0002] Oil and natural gas transmission pipelines are usually located in areas with relatively harsh environments, such as extremely cold regions, seismic zones or ocean regions. The requirements for high strength and low temperature toughness of pipelines are increasing, which has prompted the successful development of X80 pipeline steel. In recent years, my country has successively carried out large-scale development of oil and gas resources in Gansu, Qinghai, Shaanxi, Sichuan and other western regions, as well as Bohai Bay, the western South China Sea, the Yellow Sea and the continental shelf of the East China Sea, requiring a large amount of high-strength and high-toughness oil and gas pipeline steel. With the development of pipeline steel, its strength and...

Claims

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Application Information

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IPC IPC(8): B23K35/365B23K35/30B23K35/40
Inventor 张敏
Owner XIAN UNIV OF TECH
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