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Seamless submerged arc flux-cored wire capable of realizing postweld heat treatment

A technology of post-weld heat treatment and flux-cored wire, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc. It can solve the problems of inability to apply heat treatment conditions, deterioration of impact toughness, and deterioration of low-temperature toughness, etc., and achieve elongation Improvement, strong moisture absorption, good welding effect

Inactive Publication Date: 2019-08-16
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although some seamless submerged arc flux-cored welding wires in the prior art can be used for marine engineering welding, the low-temperature toughness deteriorates seriously during the heat treatment process after welding. For example, the two seamless submerged arc welding wires developed by our company Flux-cored welding wire (application number 201610653026.5 is a seamless submerged arc welding flux-cored wire suitable for marine engineering, and application number is 201610653022.7 is an ultra-low hydrogen seamless submerged arc flux-cored wire suitable for marine engineering) Deposited metal classics (580-620)℃×2.5h after heat treatment, the impact toughness deteriorates seriously, does not meet the requirements of relevant standards, and cannot be applied to post-weld heat treatment conditions

Method used

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Examples

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Effect test

preparation example Construction

[0031] The preparation method of the seamless submerged arc flux-cored welding wire is that the outer skin is first pressed into a U shape by a rolling unit, and the core powder is added online synchronously. Flux-cored wire blanks are welded at the joint by high-frequency welding to make the seamed pipe a seamless pipe, and then annealed, reduced in diameter and copper-plated to prepare a seamless submerged arc flux core with a diameter of 3.2-5.0mm welding wire. The mass of the core powder accounts for 9%-15% of the mass of the welding wire.

[0032] Conventional instruments and equipment in the art are used in the following examples. For the experimental methods without specific conditions indicated in the following examples, the conventional conditions or the conditions suggested by the manufacturer are usually followed. Various starting materials were used in the following examples, and unless otherwise stated, conventional commercially available products were used. In...

Embodiment 1

[0034] A seamless submerged arc flux-cored welding wire capable of post-weld heat treatment, the core powder of which includes the following components in mass percentage: 12% of nickel powder, 1.0% of ferromolybdenum, 18% of metal manganese, 7% of rare earth ferrosilicon, 2% ferro-titanium, 2% ferro-boron, 1% potassium fluorosilicate, 1% graphite, and the balance is iron powder and unavoidable impurities.

[0035] A seamless submerged arc flux-cored welding wire capable of post-weld heat treatment, comprising the above-mentioned flux core powder and a sheath, wherein the sheath is made of a low-carbon steel strip, and the preparation method of the seamless submerged arc flux-cored wire is as follows: firstly, the sheath is passed through a rolling unit It is pressed into a U shape, and the core powder is added online synchronously. After adding the core powder, the outer skin is rolled by the forming roll to form a flux-cored wire blank with an O-shaped cross-section. High-fre...

Embodiment 2

[0037] A seamless submerged arc flux-cored welding wire capable of post-weld heat treatment, the flux core powder includes the following components in mass percentage: 11% nickel powder, 1.2% ferromolybdenum, 15% manganese metal, 5% rare earth ferrosilicon, 2% ferro-titanium, 2% ferro-boron, 1% potassium fluorosilicate, 0.7% graphite, and the balance is iron powder and unavoidable impurities.

[0038] A seamless submerged arc flux-cored welding wire capable of post-weld heat treatment, comprising the above-mentioned flux core powder and a sheath, wherein the sheath is a low-carbon steel strip, and the preparation method of the seamless submerged arc flux-cored welding wire is the same as in Example 1. Wherein, the filling rate of the drug core powder is 11%.

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Abstract

The invention discloses seamless submerged arc flux-cored wire capable of realizing postweld heat treatment and belongs to the technical field of welding materials. The seamless submerged arc flux-cored wire is composed of an outer skin and flux-cored powder, the flux-cored powder comprises the following components in percentage by mass: 8-12% of nickle powder, 0.5-1.5% of ferromolybdenum, 12-20%of manganese metal, 3-7% of rare earth ferrosilicon, 1-2% of ferrotitanium, 1-3% of ferroboron, 0.5-1% of potassium fluosilicate, 0.5-1% of graphite and the balance of iron powder and unavoidable impurities. After heat treatment, low-alloy high-strength steel welded by adopting the seamless submerged arc flux-cored wire has low diffusible hydrogen content, stable mechanical property and proper strength, and the impact energy at minus 50 DEG C can reach 110 J or above; and in addition, after welding and heat treatment, welding seam metal welded by adopting the seamless submerged arc flux-coredwire has high toughness, so that the seamless submerged arc flux-cored wire is suitable for welding of low-alloy high-strength steel needing postweld heat treatment.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to a seamless submerged arc flux-cored welding wire capable of heat treatment after welding. Background technique [0002] Submerged arc welding is widely used in pressure vessels, offshore platforms and heavy machinery due to its high welding efficiency and good welding quality. In terms of submerged arc welding materials, compared with solid welding wire, seamless submerged arc flux cored wire has the following advantages: (1) The arc is stable, the spreadability is good, and defects such as incomplete fusion and slag inclusion are not easy to occur, and it is especially suitable for medium and thick plates and large plates. Welding of thick plates; (2) The composition is easy to adjust, and the comprehensive mechanical properties are excellent, especially low-temperature toughness; (3) The welding wire does not absorb moisture, has low diffusible hydrogen, and is conven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/368B23K35/40
CPCB23K35/3073B23K35/368B23K35/406
Inventor 朱官朋徐飞
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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