Chromium-molybdenum-seel flux welding wire

A technology of flux-cored welding wire and chrome-molybdenum steel, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of limited toughness improvement of weld metal, high welding cost, narrow application range, etc., and achieve the goal of welding Excellent process performance, good low temperature toughness and high toughness

Inactive Publication Date: 2002-07-17
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the effect is not significant, and the improvement of weld metal toughness is also limited
The flux-cored welding wire provided by the Chinese patent application CN1234313 is a tungsten argon a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example

[0019] According to the chemical composition range of the flux-cored welding wire of the present invention, low-carbon steel is used as the outer skin, and the steel strip crimping method is used to prepare three batches of seam ○-shaped φ1.2mm flux-cored welding wires. The chemical composition of the steel strip (weight %): C 0.04%, Si 0.01%, Mn 0.31%, P 0.016%, S 0.010%, the rest is Fe, and the powder filling rate is 16%. The chemical composition of the flux core of the welding wire is shown in Table 1.

[0020] Three batches of flux-cored welding wire were used, and the Cr-Mo steel plate was used as the base material, and the welding test was carried out. The size of the test board is 20×120×300mm, and the surface is free of rust stains.

[0021] Adopt DC(-) polarity, 280A, 30V, welding speed 300mm / min, CO 2 , 20 1 / min, dry elongation 20mm, welding, observe the welding process. The results show that the welding seam is formed well, the slag removal is excellent...

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PUM

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Abstract

The present invention relates to a chromium-molybolenum steel flux-cored wire, its coating is made of low-carbon steel, and core filling rate is 10-20%, and the chemical composition of core (wt%) are: CaO 3-6%, MgO 6-10%, and CaO/MgO 0.1-1, SiO2 4-7%, CaF2 0.5-6%, NaF 0.5-6%, KzSiF6 0.5-6%, and CaF2+NaF+K2SiF6 is 3-12%, one of Al2O3, TiO2, ZrO2, FeO, K2O and Na2O or sum of more than two kinds of them is greater than or equal to 6%, Cr 9-12%, Mo 2.4-4.5%, one of Si, Mn, Ti, Al and Mg or sum of more than any two kinds of them is 11-22 %, and the rest is Fe. Said ivnention not only is good in weldability, but also its weld metal toughness is excellent.

Description

[0001] Field [0002] The invention belongs to welding materials. Mainly related to flux cored wire. Background technique [0003] Flux cored wire can be divided into acid cored wire and basic flux cored wire. Acid flux-cored welding wire has been widely used in the welding of carbon steel, low-alloy steel and high-alloy steel due to its advantages such as excellent welding processability. subject to greater restrictions. The products welded by basic flux-cored wires have good weld metal toughness, but poor welding processability. For this reason, the popularization and application of this type of welding wire is affected. [0004] It can be seen from the prior art that in the development of flux-cored wires for welding chrome-molybdenum steels, people mainly focus on the development and research of acidic flux-cored wires, such as disclosed in Japanese publications Zhao 56-148493 and 57-4397, which belong to TiO 2 Type acidic flux-cored wire, but also due to the low tough...

Claims

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Application Information

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IPC IPC(8): B23K35/22
Inventor 潘川王禄田佟淑英梁东图
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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