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Sintered flux for efficient submerged arc welding and its production process

A technology of sintering flux and submerged arc welding, which is applied in the direction of welding medium, manufacturing tools, welding equipment, etc., can solve the problems that the welding quality cannot be guaranteed, the impact toughness of the weld structure and the welding performance decline, etc., and achieve superior welding performance, Meet the welding requirements, the effect of good tensile strength

Active Publication Date: 2016-10-12
武汉天高熔接股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the condition of large input energy welding, as the welding input energy increases, the coarse structure such as proeutectoid ferrite increases, the impact toughness and welding performance of the weld structure decrease significantly, and the welding quality cannot be guaranteed.

Method used

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  • Sintered flux for efficient submerged arc welding and its production process
  • Sintered flux for efficient submerged arc welding and its production process
  • Sintered flux for efficient submerged arc welding and its production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The production technique of high-efficiency submerged arc welding sintered flux of the present invention, its concrete steps are as follows:

[0021] (1) In terms of mass percentage, the components contained in the raw material are as follows: 15% SiO 2 , 25%CaF 2 , 15%Al 2 o 3 , 40% MgO, 1% K 2 O, 1% ferrosilicon, 1% B 2 o 3 , 2% CeF 3 ; First, mix the above-mentioned raw materials according to the mass ratio, put them into a V-type mixer and mix them for 10 minutes to make them fully uniform.

[0022] (2) The mixed raw materials are granulated with a binder (in terms of mass ratio, potassium silicate: sodium silicate is 1:1). Screen the 10-mesh qualified particles and dry them at 300°C.

[0023] (3) Put the dried flux into a high-temperature sintering furnace and sinter at 700°C for 1.5 hours, then discharge and cool to obtain the finished sintered flux.

Embodiment 2

[0024] Embodiment 2: The production process of the high-efficiency submerged arc welding sintered flux of the present invention is specifically the same as Embodiment 1, and the difference is as follows: (1) In terms of mass percentage, the components contained in the raw materials are as follows: 25% SiO 2 , 20%CaF 2 , 22%Al 2 o 3 , 1% Fe 2 o 3 , 25% CaO, 3% K 2 O, 1% ferrosilicon, 1.5% B 2 o 3 , 1.5% CeF 3 ; Put it into a V-type mixer and mix for 12 minutes to make it fully uniform. (2) Use a binder to granulate the mixed raw materials, screen the 40-mesh qualified particles, and dry them at 350°C. (3) The temperature of the high-temperature sintering furnace is 750° C., and the sintering time is 2 hours.

Embodiment 3

[0025] Embodiment three: the production process of the high-efficiency submerged arc welding sintered flux of the present invention is specifically the same as embodiment one, and the difference is as follows: (1) In terms of mass percentage, the components contained in the raw materials are as follows: 20% SiO 2 , 15%CaF 2 , 25%Al 2 o 3 , 0.5% Fe 2 o 3 , 34% MgO, 1.5% Na 2 O, 1% ferrosilicon, 2% B 2 o 3 , 1% CeF 3 ; Put into a V-type mixer and mix for 15 minutes to make it fully uniform. (2) Use a binder to granulate the mixed raw materials, screen the 10-mesh qualified particles, and dry them at 320°C. (3) The temperature of the high-temperature sintering furnace is 700° C., and the sintering time is 1.8 hours.

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Abstract

The invention provides sintered flux for efficient submerged-arc welding. The sintered flux is characterized by comprising, by mass, 15-25% of SiO2, 15-25% of CaF2, 15-25% of Al2O3, 0-1% of Fe2O3, 25-40% of MgO and / or CaO, 1-3% of Na2O and / or K2O, 1% of silicon iron, 1-2% of B2O3, and 1-2% of CeF3. The invention further provides a manufacturing technique of the sintered flux for efficient submerged-arc welding. The sintered flux is matched with corresponding solder wires to achieve one-side welding with back formation of an E36 steel plate with thinness smaller than or equal to 35 mm based on over 100 KJ high heat input, welding performance is excellent, tension strength and low temperature impact toughness are high, the tension strength of a high heat input welded joint is higher than 630 MPa, ductility is higher than 22%, impact energy at the temperature of -20 DEG C is higher than 100 J, and requirements for welding high-heat-input steel plates can be completely met.

Description

【Technical field】 [0001] The invention relates to the field of welding, in particular to a sintered flux for high-efficiency submerged arc welding and a production process thereof. 【Background technique】 [0002] With the development of steel structures in the direction of large-scale, high-efficiency, and lightweight, and the characteristics of modern steel structures such as complex structures, variable operating environments, and harsh loads, in order to ensure the construction quality of steel structures, my country has successfully developed medium-sized steel structures. Thick plate large input energy high strength E-grade steel plate. Under the condition of large input energy welding, as the welding input energy increases, the coarse structure such as proeutectoid ferrite increases, the impact toughness and welding performance of the weld structure decrease significantly, and the welding quality cannot be guaranteed. [0003] Therefore, improving the weld structure an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/362
CPCB23K35/362B23K35/40
Inventor 屠涛雄汪小根周丽梅李华何小婷
Owner 武汉天高熔接股份有限公司