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Submerged-arc welding wire and welding flux for high-intensity low-temperature steel

A submerged arc welding wire and low-temperature steel technology, which is applied in the field of welding wire and flux, can solve limited problems and achieve the effects of easy slag removal, beautiful weld shape, and stable arc

Active Publication Date: 2011-11-09
KUSN GINTUNE WELDING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at present, the submerged arc welding consumables for high-strength low-temperature steel produced by domestic welding manufacturers are very limited, and many of these welding consumables are imported from abroad.

Method used

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  • Submerged-arc welding wire and welding flux for high-intensity low-temperature steel
  • Submerged-arc welding wire and welding flux for high-intensity low-temperature steel
  • Submerged-arc welding wire and welding flux for high-intensity low-temperature steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046]Embodiment 1: smelt three kinds of welding wires (specification 4.0mm) with the welding wire composition designed in the present invention, denote as welding wire ①, welding wire ②, welding wire ③, its chemical composition is shown in Table 1; Produce four kinds with the flux designed in the present invention Flux, recorded as flux ①, flux ②, flux ③, flux ④, its chemical composition is shown in Table 2; welding with welding wire of the present invention and flux, welding process specification is: current 550A, voltage 32V, welding speed 420mm / min, welding Afterwards (620℃×1 hour) heat treatment, the workability is good during the welding process, and there is no air hole in the test plate after welding. The physical and chemical properties of the deposited metal after welding are shown in Table 3 and Table 4:

[0047] Table 1 Chemical composition of welding wire (weight%)

[0048]

[0049] Table 2 Soldering flux composition (weight %)

[0050]

[0051] Table 3 Ch...

Embodiment 2

[0055] Embodiment 2: Cooperate welding with welding wire of the present invention and a kind of SJ101 flux that buys on the market (recorded as flux ⑤, and flux composition sees the following table five), and welding process specification is: electric current 550A, voltage 32V, welding speed 420mm / min, Heat treatment at 620°C for 1 hour after welding. The workability is good during the welding process, and the test plate after welding is qualified. The physical and chemical properties of the deposited metal after welding are shown in Table 6 and Table 7:

[0056] Table 5 Composition of flux ⑤

[0057]

[0058] Table 6 welding wire combination flux of the present invention ⑤ welding gained deposited metal chemical composition

[0059]

[0060] Table 7 welding wire combined flux of the present invention ⑥ welded deposited metal mechanical properties

[0061]

[0062] The above examples show that the welding wire of the present invention has excellent welding operabili...

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Abstract

The invention discloses a submerged-arc welding wire and a submerged-arc welding flux for high-intensity low-temperature steel. After being matched with each other, the welding wire and the welding flux have extremely high welding operation performance that: an electric arc is stable, a welding seam is aesthetically molded, slag is easy to remove, and high crack resistance and high low-temperature impact properties are realized; and the welding seam (after being subjected to post-weld heat treatment at the temperature of 620 DEG C for 1 hour) has metal mechanical properties that: tensile strength is 480 to 660MPa, yield strength is 400 to 550MPa, elongation rate is 22 to 35 percent, and Charpy impact work is AKv(-51 DEG C) which is more than or equal to 160J.

Description

technical field [0001] The invention relates to a welding wire and a flux, in particular to a submerged arc welding wire and a flux for high-strength low-temperature steel. The weld metal has a tensile strength of 490-660MPa and an impact energy AKv≥160J at -51°C. Background technique [0002] Cryogenic technology was developed in the liquid air industry at the end of the 19th century. With the advancement of science and technology, cryogenic technology has developed rapidly in the past 30 years and has been widely used in cryogenic pressure vessels, ocean engineering, port machinery, bridges and other industries. Applications. Low-temperature pressure vessels are key equipment in low-temperature industrial processes. Low-temperature pressure vessels made of carbon steel and low-alloy steel are prone to low-temperature brittle fractures. Low-temperature brittle fractures occur suddenly without warning and are very harmful. Low-temperature steel can be generally divided into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/362
Inventor 蔡鸿祥吴俊峰郑伊洛
Owner KUSN GINTUNE WELDING
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