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Low-alkalinity and high-toughness sintered flux

A technology of sintering flux and alkalinity, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems that flux welding process performance and low temperature impact toughness can not be well balanced, and achieve excellent welding process performance, welding The effect of smooth edge transition and low increment

Active Publication Date: 2013-01-23
BEIJING JINWEI WELDING MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to overcome the disadvantage that the existing flux can not give good consideration to the welding process performance and low temperature impact toughness

Method used

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  • Low-alkalinity and high-toughness sintered flux
  • Low-alkalinity and high-toughness sintered flux

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a) Flux composition (wt%): CaF 243, Al 2 o 3 42, MgO 2 , CaO 3 , SiO 2 3,K 2 O+Na 2 O3, Si-Fe2, Mn-Fe2.

[0022] Wherein, Si in the Si-Fe is 65%, and Mn in the Mn-Fe is 92%.

[0023] b) Flux alkalinity: 1.4

[0024] c) Preparation method: sieve the required raw materials and weigh according to the formula. After rechecking the total weight, put the dry powder into a dry mixer for dry mixing. After dry mixing evenly, put it into a wet mixer, and add a) About 20% of the total weight of the ingredients in the water glass is wet-mixed. After the wet-mixing is uniform, the wet powder is sent to the granulation tray through the conveyor belt for granulation. After the granulation is completed, it is sent to the drying furnace through the conveyor belt. Carry out drying, remove the moisture and sieve the flux, send the sieved flux within the standard particle size range into the sintering furnace, sinter at 700°C to 750°C for 1 hour, and sieve again after cooling out ...

Embodiment 2

[0032] a) Flux composition (wt%): CaF 2 44, Al 2 o 3 42, MgO2, CaO2, SiO2 2 3.5,K 2 O+Na 2 O3, Si-Fe1.5, Mn-Fe2. Wherein, Si in the Si-Fe is 55%, and Mn in the Mn-Fe is 85%.

[0033] b) Flux alkalinity: 1.5

[0034] c) preparation method: same as Example 1

[0035] d) Chemical composition of deposited metal (with H10Mn2HIC welding wire), %

[0036]

C

Si

mn

P

S

Wire Composition

0.091

0.05

1.59

0.005

0.001

Deposited metal composition

0.096

0.37

1.49

0.007

0.004

[0037] e) Mechanical properties of deposited metal (with H10Mn2HIC welding wire)

[0038]

[0039] In addition, referring to the flux prepared by the method described in Example 1 of CN1326838A, it was tested according to e) above, and the impact value at -30°C was 140-175, showing significantly worse performance than the flux of the present invention.

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Abstract

The invention provides a low-alkalinity and high-toughness sintered flux, which comprises the components in part by weight: 35-55 parts of CaF2, 35-50 parts of Al2O3, 1-5 parts of MgO, 1-5 parts of CaO, 2-6 parts of SiO2, 1-5 parts of Si-Fe, 1-5 parts of Mn-Fe and 2-5 parts of K2O+Na2O. After the sintered flux is adopted, on the premise of guaranteeing higher low-temperature impact toughness of weld metal, the alkalinity of the flux is reduced, and the welding technological performance of the flux is improved.

Description

technical field [0001] The invention relates to a sintered flux with low alkalinity and high toughness, which is mainly suitable for submerged arc welding of low alloy steel, especially for welding of thick-walled pressure vessels. Background technique [0002] With the development of modern industry and the improvement of automation level, submerged arc automatic welding is widely used in the production of large-scale welding structures such as pipelines, ships, boilers, and pressure vessels due to its high degree of automation, fast welding speed, and stable weld performance. application. Therefore, the stability of the supporting welding material performance is particularly important. Not only the weld metal must have high strength and high toughness, but also have good welding process performance during the welding process. For submerged arc welding, in addition to the welding wire, the performance of the weld and the quality of the weld mainly depend on the flux. Prev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/362
Inventor 陈波夏毅冰王学东李伟李柱高志深王士山卢兰志李钊王磊
Owner BEIJING JINWEI WELDING MATERIAL
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