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A low-hydrogen welding rod for root welding of pipelines

A low hydrogen type, root welding technology, applied in welding media, welding equipment, welding/cutting media/materials, etc., can solve the problems of poor welding arc stability, poor welding process performance, poor operating performance, etc., and achieve the arc blowing force. Large, easy to double-sided forming, large penetration effect

Active Publication Date: 2016-06-08
TIANJIN GOLDEN BRIDGE WELDING MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-hydrogen electrode has good desulfurization, dephosphorization and dehydrogenation capabilities, excellent crack resistance and comprehensive mechanical properties, but its welding process performance is poor, welding arc stability is poor, large spatter, and poor operability

Method used

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  • A low-hydrogen welding rod for root welding of pipelines
  • A low-hydrogen welding rod for root welding of pipelines
  • A low-hydrogen welding rod for root welding of pipelines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take marble powder, fluorite powder, quartz powder, rutile powder, ferro-titanium powder, ferrosilicon powder, ferro-manganese powder, magnesite powder, and sodium carbonate powder, and mix them in the following mass fraction ratio:

[0022]

[0023] Mix the above mixed ingredients evenly as the raw material of the electrode coating, and set aside;

[0024] Take a wire rod with a suitable diameter and a material of H08A, cut it into a suitable length as the welding core of the welding rod, and set it aside;

[0025] The above raw materials are made into finished welding rods according to the known preparation methods of welding rods, that is, low-hydrogen welding rods for root welding of pipelines are obtained.

[0026] Pipeline root welding is performed on this electrode. The electrode has good welding process performance. The welding process realizes single-sided welding and double-sided forming. At the same time, the weld shape is beautiful and the slag removal is...

Embodiment 2

[0028] Take marble powder, fluorite powder, quartz powder, rutile powder, ferro-titanium powder, ferrosilicon powder, ferro-manganese powder, magnesite powder, and sodium carbonate powder, and mix them in the following mass fraction ratio:

[0029]

[0030]

[0031] Mix the above mixed ingredients evenly as the raw material of the electrode coating, and set aside;

[0032] Take a wire rod with a suitable diameter and a material of H08A, cut it into a suitable length as the welding core of the welding rod, and set it aside;

[0033] The above raw materials are made into finished welding rods according to the known preparation methods of welding rods, that is, low-hydrogen welding rods for root welding of pipelines are obtained.

[0034] Pipeline root welding is performed on this electrode. The electrode has good welding process performance. The welding process realizes single-sided welding and double-sided forming. At the same time, the weld shape is beautiful and the sla...

Embodiment 3

[0036] Take marble powder, fluorite powder, quartz powder, rutile powder, ferro-titanium powder, ferrosilicon powder, ferro-manganese powder, magnesite powder, and sodium carbonate powder, and mix them in the following mass fraction ratio:

[0037]

[0038] Mix the above mixed ingredients evenly as the raw material of the electrode coating, and set aside;

[0039] Take a wire rod with a suitable diameter and a material of H08A, cut it into a suitable length as the welding core of the welding rod, and set it aside;

[0040] The above raw materials are made into finished welding rods according to the known preparation methods of welding rods, that is, low-hydrogen welding rods for root welding of pipelines are obtained.

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Abstract

The invention provides a low-hydrogen electrode for root welding on pipelines. The low-hydrogen electrode is characterized in that a core wire of the low-hydrogen electrode is made of H08A steel, and a coating of the low-hydrogen electrode comprises marble, fluorite, quartz, rutile, ferrotitanium, ferrosilicon, ferromanganese, magnesia and sodium carbonate. The low-hydrogen electrode has the advantages that raw materials of the coating are reasonably proportioned, so that the electrode is excellent in mechanical property and welding technological property; during welding, the low-hydrogen electrode is high in electric arc blow force, and electric arcs are concentrated and are good in stability, so that the electrode is high in weld penetration depth during welding; a single-side welding and double-side forming effect can be easily realized when root welding is performed on the pipelines, formed weld joints are attractive, and the low-hydrogen electrode is good in slag detachability; the low-hydrogen electrode is low in deposited metal impurity element content and excellent in strength, ductility and toughness; the content of diffusible hydrogen meets low-hydrogen standards, and the electrode is excellent in crack resistance and porosity resistance; when the low-hydrogen electrode is used for welding the pipelines during actual production, chip roots of weld on the backs of the pipelines can be prevented, and backing weld on the pipelines can be omitted, and accordingly the work efficiency can be improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a low-hydrogen welding rod for root welding of pipelines. Background technique [0002] In the construction of long-distance pipelines, the pipeline welding process is very important, and the welding quality of the nozzle is directly related to the safety of pipeline operation. During pipeline construction, for irregular welding parts such as rework or joints, it is convenient to use electrode welding, easy to operate, and easy to control quality. [0003] Root welding, also known as root welding, refers to the first welding seam of the nozzle in the on-site welding. There is only one welding seam, and it is characterized by requiring single-sided welding and double-sided forming (except for some mechanized root welding). [0004] When using traditional low-hydrogen electrodes for root welding of pipelines, if one-sided welding and double-sided forming are to be achieved, it is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/365
CPCB23K35/3602B23K35/365
Inventor 侯来昌唐艳丽
Owner TIANJIN GOLDEN BRIDGE WELDING MATERIALS GRP
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