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A basic welding backing material

A welding backing and alkaline technology, which is applied in the field of backing materials and alkaline welding backing materials, can solve the problems of reduced impact toughness of weld seam and failure to meet the performance requirements of welded joints, etc., and achieve uniform and smooth welding seam formation Effect

Active Publication Date: 2018-01-19
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

Traditional cordierite liner materials, due to the low alkalinity of the liner slag (less than 0.3), during the welding process, the liner slag and the weld metal undergo metallurgical reactions, causing fine oxides in the weld Slag inclusion, this kind of slag inclusion has little effect on the strength of the weld, but it significantly reduces the impact toughness of the weld, especially the low temperature impact toughness
Therefore, for the welding of steel materials that require low temperature impact performance, cordierite liner materials cannot meet the performance requirements of welded joints

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: by weight content 43.56%MgO and CaO, 33.84%SiO of each oxide component in the final product material 2 , 18.42%Al 2 o 3 , 1.53% Fe 2 o 3 , 3.04% Na 2 O and K 2 The proportion of O, take the powder of these oxides or mineral powder containing these oxides such as clay, feldspar, bauxite, magnesite, etc. as raw materials, mix and granulate the raw materials, and then press and sinter to obtain the liner Liner block material with a slag basicity of 1.06.

Embodiment 2

[0034] Embodiment 2: press the weight content of each oxide component in the final product material 54.21%MgO and CaO, 27.64%SiO 2 , 13.54%Al 2 o 3 , 1.54% Fe 2 o 3 , 2.74% Na 2 O and K 2 The proportion of O, take the powder of these oxides or mineral powder containing these oxides such as clay, feldspar, bauxite, magnesite, etc. as raw materials, mix and granulate the raw materials, and then press and sinter to obtain the liner Liner block material with a slag basicity of 1.56.

Embodiment 3

[0035] Embodiment 3: by weight content 64.54%MgO and CaO, 26.66%SiO of each oxide component in the final product material 2 , 7.2% Al 2 o 3 , 1.68% Fe 2 o 3 , 1.53% Na 2 O and K 2 The proportion of O, take the powder of these oxides or mineral powder containing these oxides such as clay, feldspar, bauxite, magnesite, etc. as raw materials, mix and granulate the raw materials, and then press and sinter to obtain the liner Liner block material with a slag basicity of 2.05.

[0036] like figure 1 As shown, paste the back of the ceramic liner material 1 listed in the above embodiment and the aluminum foil pressure-sensitive adhesive 2 together, and then attach the aluminum foil pressure-sensitive adhesive 2 together with the ceramic liner material 1 to the welded steel plate 3 On top, rooting welding 4 and filling welding 5 are carried out, and the test conditions are as follows:

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Abstract

The invention discloses an alkaline weld backing material. The finished alkaline weld backing material comprises the following components in percentage by weight: 40-75% of MgO and / or CaO, 15-40% of SiO2, 0-25% of Al2O3, 0-3% of Fe2O3 and 0.5-4% of Na2O and / or K2O; the alkalinity of the alkaline weld backing material is greater than 1. The alkaline weld backing material has the benefits that through a preferred material formula, the alkalinity of backing slag is controlled, the physicochemical property of the backing slag is adjusted, and the requirements on a high-strength high-toughness welding joint are met. Through the adoption of the backing material for welding, a formed welding seam is uniform and smooth no matter in a downward welding or vertical welding position. Compared with the conventional cordierite backing material, the mechanical properties, in particular to the low-temperature impact toughness, of the welding seam are remarkably improved. Besides, through the adjustment of the formula of the raw materials, the alkalinity of the backing slag is controlled, and different mechanical property requirements on the welding joints can be met.

Description

technical field [0001] The invention relates to a backing material used in backing welding, in particular to an alkaline welding backing material that can be applied to high-strength and high-toughness joint performance requirements, and belongs to the field of metal material welding. Background technique [0002] Generally speaking, the backing material used in traditional backing welding is a backing material with cordierite (Cordierite) as the main phase, and the weight percentage of the backing material is: 40%-60% SiO 2 , 30%-45% Al 2 o 3 , 3%-18% MgO as a representative. Although this kind of cordierite liner material has an excellent effect on the formation of the back weld seam, the liner slag composed of it has low alkalinity and can only be applied to general welded joints with poor mechanical properties, especially low-temperature impact properties. Welding of high metal materials. [0003] With the continuous emergence of high-performance steel, it has become...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/22B23K35/40
CPCB23K35/22B23K35/40
Inventor 肖苏洋肖诗祥屠涛雄周丽梅汪小根
Owner 武汉天高熔接股份有限公司
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