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Acidic flux cored wire for ultralow-hydrogen low-temperature steel

A technology of flux-cored welding wire and low-temperature steel, applied in welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of poor low-temperature toughness, high hydrogen diffusion of deposited metal, etc., and achieve improved mechanical properties and small spatter , The effect of elongation improvement

Inactive Publication Date: 2011-09-28
CHANGZHOU JIUTONG WELDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the technical problem of high hydrogen diffusion and poor low temperature toughness of the existing low temperature steel acidic flux cored welding wire deposited metal

Method used

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  • Acidic flux cored wire for ultralow-hydrogen low-temperature steel
  • Acidic flux cored wire for ultralow-hydrogen low-temperature steel
  • Acidic flux cored wire for ultralow-hydrogen low-temperature steel

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Experimental program
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Effect test

Embodiment 1

[0010] Embodiment 1 Preparation of ultra-low hydrogen low temperature steel flux-cored welding wire

[0011] Flux-cored welding wire is prepared by a common manufacturing process: the powders of each component are passed through an 80-mesh sieve, and various powders are put into a powder mixer according to the proportion (Table 1) and stirred for 40 minutes, and then the mixed powder is added to the V-shaped steel strip (steel The strip composition is shown in Table 2) in the slot, the drug powder accounts for 16-17% of the total weight of the welding wire; the forming machine closes the strip slot; table 3).

[0012] Table 1 Flux cored wire powder formula (mass percentage%)

[0013]

[0014] Table 2 steel strip composition (mass percentage %)

[0015] Strip serial number

C

Si

mn

P

S

Steel strip 1

0.05

0.04

1.3

0.015

0.015

Steel belt 2

0.03

0.02

3.5

0.006

0.006

Steel bel...

Embodiment 2

[0019] Embodiment 2 Flux cored wire performance test

[0020] According to the GB / T 10045 testing method, test the performance indicators of the welding wire in Table 3, and the results are shown in Table 4:

[0021] Table 4 Performance indicators of different welding wires

[0022]

[0023] Experimental results show that the welding wire prepared by the acidic flux core of the present invention has low hydrogen content in the deposited metal diffusion, good low-temperature impact toughness of the weld seam, and improved elongation; the welding wire prepared by the steel strip of the present invention has yield strength, tensile strength, tensile strength The elongation is improved, the mechanical properties are greatly improved, and the low temperature impact toughness is further improved.

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Abstract

The invention relates to an acidic flux cored wire for ultralow-hydrogen low-temperature steel, consisting of a welding wire steel sheet skin and a flux core, wherein the traditional Chinese powder of the flux core comprises rutile, electrolytic manganese, reduced iron powder, magnesium powder, ferroboron, lithium fluoride, metallic nickel powder, ferrotitanium, titanate, rare-soil silicon, cryolite and feldspar. A steel belt used for the surface of the welding wire comprises the following components by weight percent: less than or equal to 0.05% of C, less than or equal to 0.04% of Si, less than or equal to 3.5% and more than or equal to 1.5% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S and the balance of Fe. The acidic flux cored wire has the advantages that the low-temperature impact toughness is good and the hydrogen content is low; and the acidic flux cored wire is applicable to welding of a large spherical tank of liquefied petroleum gas, an ocean platform and a drilling ship.

Description

technical field [0001] The invention relates to the field of metal welding materials, in particular to an acidic flux-cored welding wire for ultra-low hydrogen and low-temperature steel. Background technique [0002] With the rapid development of my country's offshore platform and petrochemical industry, various drilling platforms, diving operation vessels and other offshore operating platforms and ships have developed rapidly, and the mining area has also expanded from the shallow sea medium temperature area in the past to the deep sea low temperature area. In order to prevent the susceptibility to welding cracks, low temperature steel is often used for construction, and the demand for low temperature steel flux cored wire is also increasing. Alkaline titanium-calcium type flux-cored welding wire, the diffusible hydrogen content is generally 8-12ml / 100g, a large amount of basic oxide is added to the powder to increase the alkalinity of the slag, so that the low-temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/368
Inventor 戚建春吴蔡春
Owner CHANGZHOU JIUTONG WELDING MATERIAL
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