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A kind of flux for submerged arc welding that can reduce the hydrogen diffusion of weld metal and its preparation method

A technology of weld metal and submerged arc welding, which is applied in metal processing equipment, welding equipment, manufacturing tools, etc., can solve the problems of inapplicable production development, ineffective removal of diffusible hydrogen, etc., and achieve good weld metal deposition. , good mechanical properties, strong slag-making ability

Active Publication Date: 2022-01-25
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, in the case of welding accidents caused by diffused hydrogen, although the flux will be added and dried before use to remove the moisture content in the flux, but only the free water is evaporated, and the diffused hydrogen is still It cannot be effectively removed. The traditional method of only relying on the composition and performance of welding consumables is no longer applicable to the current production development. The hydrogen content in weld seams caused by insufficient functionality of welding consumables has also become a criterion for evaluating welding quality. Important indicators

Method used

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  • A kind of flux for submerged arc welding that can reduce the hydrogen diffusion of weld metal and its preparation method
  • A kind of flux for submerged arc welding that can reduce the hydrogen diffusion of weld metal and its preparation method
  • A kind of flux for submerged arc welding that can reduce the hydrogen diffusion of weld metal and its preparation method

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preparation example Construction

[0029] The details of the preparation method of the flux are as follows:

[0030] 1) Ingredients:

[0031] According to the mass percentage of the main components of the flux, the ratio of various raw materials is carried out, and the raw materials are ground, and the particle size is required to be 240-280 mesh;

[0032] 2) Dry mix:

[0033] After the raw material ratio is good, stir and mix well, and the time is controlled at more than 30 minutes, so that it can be fully stirred;

[0034] 3) wet mixing:

[0035] In the wet mixing, the traditional sodium potassium water glass binder is replaced by adding fine powdered polyvinyl alcohol (PVA) binder, and its weight is controlled at 15% of the total weight of the flux raw material, and it is added slowly and continuously stirred. It is fully stirred and mixed;

[0036] 4) Granulation:

[0037] Mix the wet-mixed raw materials into granules with a vibrating container, and screen them with an 80-mesh sieve;

[0038] 5) Dryin...

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Abstract

The invention discloses a flux for submerged arc welding which can reduce the hydrogen diffusion of weld metal. The flux for submerged arc welding comprises the following raw materials in mass percentage: CaO 10-20%, CaF 2 5~10%, MgO45~55%, Al 2 o 3 20~30%, MnO5~10%, SiO 2 5~10%, S≤0.06%, P≤0.08%; its preparation method comprises the following steps: batching→dry mixing→wet mixing→granulation→drying→sintering→sieving; the flux composition provided by the invention is stable, In terms of welding performance, it has good mechanical properties, good weld metal deposition, strong slagging ability, and can reduce the hydrogen diffusion of weld metal.

Description

technical field [0001] The invention belongs to the field of flux, and relates to a flux for submerged arc welding that can reduce the hydrogen diffusion of weld metal and its preparation method. This product is widely used in welding environments with heavy water content, such as marine environment welding projects, bridge welding engineering etc. Background technique [0002] Submerged arc welding is carried out by covering the submerged arc flux on the workpiece to be welded. It is a commonly used industrial welding process. Its principle is very similar to that of electrode welding. The submerged arc welding flux plays a role in the submerged arc welding process. The effect is very similar to that of the coating on the surface of the electrode. In the welding process of metal materials, especially high-strength materials, once there is excessive diffusible hydrogen, it may cause hydrogen embrittlement of the material, form hydrogen cracks, or brittle white spots reduce ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/36B23K35/362
CPCB23K35/3602B23K35/362
Inventor 金宝安方超
Owner MAANSHAN IRON & STEEL CO LTD
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