Stainless steel flux-cored wire for welding galvanized steel sheets and arc welding method for galvanized steel sheets using the same

An arc welding method and technology of galvanized steel sheet, applied in arc welding equipment, welding medium, welding equipment, etc., can solve the problems of zinc embrittlement cracks, poor welding slag peeling, and low ductility of deposited metal in weld metal. , to achieve the effect of no welding cracks and good post-treatment corrosion resistance

Active Publication Date: 2011-11-30
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, when this method is used to weld zinc-based alloy-coated steel sheets, zinc embrittlement cracks in the weld metal often occur depending on the welding process conditions, and the occurrence cannot be prevented stably.
In addition, there are problems such as low ductility of the deposited metal obtained by this method, low arc stability in welding workability, and poor spatter peelability.

Method used

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  • Stainless steel flux-cored wire for welding galvanized steel sheets and arc welding method for galvanized steel sheets using the same
  • Stainless steel flux-cored wire for welding galvanized steel sheets and arc welding method for galvanized steel sheets using the same
  • Stainless steel flux-cored wire for welding galvanized steel sheets and arc welding method for galvanized steel sheets using the same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] First, in order to confirm the effect of suppressing zinc embrittlement cracking, the effect of the welding material and the influence of the type of plating were investigated.

[0129] Among the stainless steel flux-cored wires containing the alloy components shown in Table 1, stainless steel flux-cored wires with slag forming agents having the compositions shown in Table 1 and Table 3 were trial-produced. The asterisk (*) in Table 1 and Table 3 indicates the degree of content as an unavoidable impurity. The wire diameter is set to 1.2mm. As the galvanized steel sheet, a zinc-based alloy-coated steel sheet in which three types of coating layers shown in A to C were coated on a raw steel sheet to be coated with a thickness of 5 mm and a tensile strength of 400 MPa class was used.

[0130] A: Hot-dip galvanized steel sheet based on JIS G 3302

[0131] B: Steel sheet based on hot-dip galvanized-5% aluminum alloy based on JIS G 3317

[0132] C: Zn-11%Al-3%Mg-0.2%Si coat...

Embodiment 2

[0144] Next, the influence of the composition of the raw plate to be plated on zinc embrittlement in the welding heat-affected zone of the steel plate to be plated was evaluated. The original plate to be plated is a steel material with a tensile strength of 270MPa to 590MPa, and its composition is shown in Table 5. Underlines in Table 5 indicate values ​​outside the range of the present invention. The plating layer was made into the plating layer whose composition was C: Zn-11%Al-3%Mg-0.2%Si of Example 1. The welding wire No. 1 of Example 1 was used.

[0145] Welded test pieces for crack evaluation were used as above Figure 6 The shown welding test body was welded under conditions of a welding current of 160 to 200 A and a shielding gas of CO2. The zinc embrittlement cracks in the heat-affected zone of the base metal were evaluated using the dye penetrant test. In addition, evaluation was performed under the condition that the plate thickness is 2.3 mm, which is relativel...

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Abstract

A stainless steel flux-cored welding wire for the welding of galvanized steel sheets, which dose not cause zinc embrittlement cracking, can give welds excellent in corrosion resistance and ductility, and attains excellent workability in welding; and a process for welding with the same. The welding wire is characterized in that the sheath and the flux contain, as metal or alloying components and in a total amount based on the total mass of the wire, C: 0.01 to 0.05%, Si: 0.1 to 1.5%, Mn: 0.5 to 3%, Ni: 7 to 10% and Cr: 26 to 30% with the F value falling within the range of 30 to 50, that the flux contains, as slag formers, TiO2: 3.8 to 6.8%, SiO2: 1.8 to 3.2%, ZrO2: 1.3% or below, and Al2O3: 0.5% or below, that the total amount of these slag formers and the other slag formers is 7.5 to 10.5%, that TiO2 accounts for 50 to 65% of the total amount of all the slag formers, and that the balance of the sheath and the flux consists of Fe and unavoidable impurities.

Description

technical field [0001] The present invention relates to a stainless steel flux-cored wire for welding galvanized steel sheets that can ensure the corrosion resistance of a welded zone without post-treatment such as repair (touch up) and an arc welding method for galvanized steel sheets using the wire, In particular, it relates to a stainless steel flux-cored wire for welding galvanized steel sheets that does not generate welding cracks and has good welding workability (welding processability), and an arc welding method for galvanized steel sheets using the wire. [0002] In addition, the galvanized steel sheet to be welded as the object of the present invention includes galvanized steel sheet and zinc-based alloy-coated steel sheet. Background technique [0003] Galvanized steel sheets are widely used in fields such as construction and automobiles from the viewpoint of improving the corrosion resistance of structural parts. In the past, the following methods have been used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/368B23K9/173B23K9/23B23K35/30C22C18/00C22C18/04C22C38/00C22C38/14
CPCC22C38/40B23K35/0266B23K35/3053C22C38/02C22C38/04B23K35/368B23K35/362B23K35/3086B23K9/173B23K9/23B23K35/30
Inventor 儿玉真二浅井谦一水本学石田钦也
Owner NIPPON STEEL CORP
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