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Submerged arc sintered flux for stainless steel at low temperature

A technology of sintering flux and submerged arc welding, which is applied in the field of submerged arc welding of stainless steel and medium and thick plate welding, and can solve the problems of poor low temperature toughness and poor welding process performance, etc.

Active Publication Date: 2019-01-11
BEIJING JINWEI WELDING MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to overcome the shortcomings of the existing stainless steel submerged arc flux welding process performance at low temperature and poor low temperature toughness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] a) The ingredients ratio of the dry powder part of the flux:

[0068] 27 parts by weight of dry ground fluorite, 22 parts by weight of white corundum, 25 parts by weight of sintered magnesia, 23 parts by weight of wollastonite, and 3 parts by weight of alloy powder;

[0069] Alloy powder: nickel 25% chromium 56% alloy powder;

[0070]The binder sodium silicate accounts for 22% of the dry powder weight, the ratio of potassium to sodium is 1:1, 43.2°Bé (20°C), and the modulus is 3.3.

[0071] b) Flux alkalinity: 2

[0072] c) Preparation method: Mix the dry powder materials in the proportion of ingredients evenly, add water glass, carry out wet mixing, then granulate, then dry at 200-330°C for 30-50min at low temperature, sieve, and then dry at 700-800°C Sinter at high temperature for 45-60 minutes, then cool and sieve. The specific method is: sieve the required raw materials and weigh according to the formula, recheck the total weight, put the dry powder into the dry ...

Embodiment 11

[0081] CN102581518A (Chinese Patent Application No. 2012100794134, Jinwei) specification [0153] Table 1 discloses 6 kinds of flux formulations of S1 to S6, wherein the amount of white corundum used is obviously lower than that of the present invention, and the amount of wollastonite is obviously lower than that of the present invention High, the alloy powder used is nickel alloy powder.

[0082] In this embodiment 11, the inventor used 6 kinds of flux formulations of S1~S6 of CN102581518A, CaF 2 With dry ground fluorite, Al 2 o 3 Use white corundum, MgO, sintered magnesia, CaO and SiO 2 The added amount uses wollastonite and alloy powder to use Example 1 of the present invention instead, and the other conditions refer to the formula and preparation method of Example 1 of the present invention to obtain 6 kinds of fluxes according to the "d) performance investigation" of Example 1 of the present invention. ER308L welding wire was inspected, the results of 6 kinds of fluxes: ...

Embodiment 12

[0085] Table 1 of Example 1 of CN108057964A (Chinese Patent Application No.: 201711323063.0, Jinwei) discloses five flux formulations of N1 to N5, in which the amount of fluorite used is obviously higher than that of the present invention, and aluminum fluoride is also used Potassium acid, the alloy powder used is ferroniobium alloy powder.

[0086] In this embodiment 12, the present inventor used 5 kinds of flux formulations of N1-N5 of CN108057964A, the alloy powder was changed to the embodiment 1 of the present invention, and the remaining conditions were referred to the formula and preparation method of the embodiment 1 of the present invention to obtain 5 kinds Welding flux is investigated according to "d) performance investigation" of embodiment 1 of the present invention and cooperates ER308L welding wire to investigate, the result of 5 kinds of welding fluxes:

[0087] Tensile strength (R m / Mpa) in the range of 470~510, elongation (A / %) in the range of 32~36, -196 ℃ ...

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Abstract

The invention relates to a submerged arc sintered flux for stainless steel at the low temperature. The submerged arc sintered flux is prepared from dry powder with various components and binder sodiumsilicate and is characterized in that the dry powder is prepared from, by weight, 15-30 parts of fluorite, 15-30 parts of white corundum, 20-35 parts of magnesia, 10-25 parts of wollastonite and 1-5parts of alloy powder. The flux is prepared by a method comprising the following steps that dry powder materials are evenly mixed according to the matching ratios, sodium silicate is added, wet mixingis carried out, then granulation is carried out, the granules are dried at the low temperature of 200-330 DEG C for 30-50 min, screened, sintered at the high temperature of 700-800 DEG C for 45-60 min, cooled and screened, and therefore the submerged arc sintered flux is obtained. The submerged arc sintered flux has the excellent effects shown in the description.

Description

technical field [0001] The invention relates to a low-temperature submerged-arc sintering flux for stainless steel, which is mainly suitable for submerged-arc welding of stainless steel, especially for medium-thick plate welding in petrochemical, nuclear power and other industries. Background technique [0002] With the development of modern industry and the improvement of automation level, stainless steel submerged arc automatic welding has been widely used in petrochemical, nuclear power and other industries due to its high degree of automation, fast welding speed and good weld process performance. At present, when ordinary flux is used for welding medium and thick plates, the process performance such as forming and slag removal is not good, the alloy elements are burned, the toughness is poor at -196°C, and the corrosion resistance cannot meet the needs of high-end users. Therefore, its matching The performance of welding consumables is particularly important. Previous s...

Claims

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Application Information

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IPC IPC(8): B23K35/36
CPCB23K35/3605
Inventor 崔晓东王士山李伟王学东朱海滨陈亮白建斌王立志王磊
Owner BEIJING JINWEI WELDING MATERIAL
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