Flux-cored wire

A technology of flux-cored welding wire and welding wire, which is applied in welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of no one proposed specific plan, reduced usage ratio, low workability of solid core welding wire, etc., and achieves excellent performance. The effect of welding workability, high temperature crack resistance, good tensile strength and impact toughness of weld metal

Inactive Publication Date: 2009-04-01
SUPAITE METAL KUSN
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Problems solved by technology

[0005] But strictly speaking, the gas shielded arc welding solid core wire proposed in the public license can only be applied to the priority range of the maximum welding heat of 40KJ/cm, and can only weld steel with a tensile strength below 520Mpa, and compared with the flux core Welding wire, the workability of solid welding wire is lo

Method used

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  • Flux-cored wire
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Examples

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Example Embodiment

[0045] Example:

[0046] Prepare a 1.4mm diameter gas shielded arc welding flux-cored wire in advance according to the following table 1. At this time, the filling rate of the powder is 15-20%, and the composition and content of the powder used is the weight percentage to the total weight of the welding wire, and is recorded in Table 2.

[0047]【Table 1】

[0048]

[0049]

[0050] * is the sum of one or more substances selected from Na, K, Li and Cs.

[0051] ** is the sum of one or more selected from Mg, Ca, Ba, Al and Zr.

[0052] *** is C+Si / 25+Mn / 5+Ni / 40+Mo / 5

[0053] 【Table 2】

[0054] Classification C Si Mn P S Fe content 0.025 0.0025 0.21 0.009 0.01 residual

[0055] Using the above welding wire, the SM520B welding mother with a thickness of 25mm was welded. The specific welding conditions are shown in Table 3. After welding, the welding workability, mechanical properties, and high temperature cracking resistance of the weld...

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Abstract

The invention discloses a flux-cored wire, which relates to a flux-cored wire with medicinal powder filled in a soft steel sheath that is specially used for gas shielded arc welding. Each component of the medicinal powder has the following percentages by weight relative to wires: 3.0% to 11.0% of TiO2; 0.02% to 0.10% of C; 0.3% to 1.2% of Si; 0.7% to 2.0% of Mn; 0.1% to 1.5% of Ni; 0.1% to 1.2% of Mo; 0.0010% to 0.0045% of B; 0.05% to 1.00% of the sum of any one or more than two elements of Na, K, Li and Cs; 0.05% to 1.00% of the sum of any one or more than two elements of Mg, Ca, Ba, Al and Zr; balance iron powder and irremovable impurities, and the composition of each element satisfies the conditional expression that C+Si/25+Mn/5+Ni/40+Mo/5 is greater than or equal to 0.25 and is less than or equal to 0.60; the electric arc welding for gas shielding at the conditions that the maximum welding heat is 60KJ/cm and the maximum interlayer-temperature is 350 DEG C has excellent welding operation, fine welding metal intensity of tension and impact ductility.

Description

technical field [0001] The invention relates to a flux-cored welding wire for gas-shielded arc welding. Background technique [0002] Recently, some changes have taken place in the steel used in steel structures, bridges and construction fields. In the past, mild steel and steel with a tensile strength of 490Mpa were mainly used, but recently, the demand for steel with a tensile strength of 520Mpa has increased sharply for the purpose of enhancing shock resistance and lightweight steel, thereby saving costs; [0003] However, the development of flux-cored wires that meet these requirements and the special welding environment on site, and meet the high heat input and interlayer temperature conditions is almost blank; [0004] As a steel welding material with a tensile strength of 520Mpa, Korean Patent No. 2006-0050038 records the control of the sum of C, S, Mn, S, Ti, Mo, Cu, Mn and Mo contents; the sum of Si and Ti contents; And solid wire for gas-shielded arc welding with...

Claims

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Application Information

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IPC IPC(8): B23K35/30
Inventor 柳彻
Owner SUPAITE METAL KUSN
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