Welding method for doping trace boron element into weld metal

A technology of weld metal and welding method, which is applied in the field of welding metallurgy and alloying, to achieve the effect of improving the level of toughness, improving toughness and improving service safety

Inactive Publication Date: 2017-03-22
江苏立新焊接材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the field of welding material application, there is no report on the use of borides for boronizing.

Method used

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  • Welding method for doping trace boron element into weld metal
  • Welding method for doping trace boron element into weld metal
  • Welding method for doping trace boron element into weld metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] According to the metallurgical method of the present invention, the matching manual electrode design for 12MnCrNi steel is implemented. According to the technical requirements of the 12MnCrNi steel matching manual welding rod (see Table 1), design and make three batches of 12MnCrNi steel matching manual welding rods containing borax (sodium tetraborate, Na2B4O7. Middle), the composition of the steel core and coating powder used in the three batches of electrodes are shown in Table 2 and 3, respectively. The base metal and welding process parameters of the three batches of electrodes are shown in Table 4. After welding, the mechanical properties of the deposited metal were tested, and the test results are shown in Table 5. As a comparison, see Table 6 for the test data of 12MnCrNi steel supporting manual electrodes that do not contain borides on the original drug skin.

Embodiment ——12

[0014] Table 1 embodiment - technical requirements for 12MnCrNi steel supporting manual welding rod

[0015] Deposited Metal Mechanical Properties

[0016]

[0017] Table 2 embodiment——12MnCrNi steel matching manual electrode steel core composition (weight, %) (specification 4mm)

[0018]

[0019] Table 3 embodiment - 12MnCrNi steel matching manual electrode coating composition (weight, %)

[0020]

[0021] Potassium sodium mixed with water glass is used for bonding, and the outer diameter of the coating is 6.0mm.

[0022] The embodiment of table 4 - the base metal and welding process parameters of three batches of welding rods

[0023]

[0024] Table 5 Example - three batches of electrode deposited metal chemical composition and mechanical properties

[0025]

[0026] Table 6 Chemical composition and mechanical properties of deposited metal of 12MnCrNi steel with manual electrode without boride coating

[0027]

[0028] It can be seen that compared with ...

Embodiment 2

[0030] The metallurgical method according to the present invention was implemented in an improved design of 350 flux. Design and make three batches of flux containing B 2 o 3 The 350G flux, the flux production method is the same as the original 350 flux. The components of the three batches of flux are shown in Table 7, respectively. The welding wire for the three batches of flux is 12MnCrNi (size 4mm), and the base metal and welding process parameters are shown in Table 8. After welding, the mechanical properties of the deposited metal were tested, and the test results are shown in Table 9.

[0031] Table 7 Example - 350G flux composition (weight, %)

[0032]

[0033] Table 8 Example - Base metal and welding process parameters welded by three batches of flux 350G

[0034]

[0035] Table 9 Examples - Chemical Composition and Mechanical Properties of Deposited Metal

[0036]

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PUM

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Abstract

The invention relates to a welding method for doping the trace boron element into weld metal. The welding method includes the steps that the boride is added into a welding material, and the mass ratio of the boride to the welding material is 0.5-1:100; and the welding material is a manual electrode coating or the flux-core of a flux-cored wire. When the boride-containing welding material is used for welding, elemental boron can be decomposed in the welding arc space from the boride, the elemental boron is doped into the weld metal, and the welding current is higher than 171A.

Description

technical field [0001] The invention relates to a welding metallurgical alloying method, in particular to a welding method for infiltrating trace boron elements into weld metal. Background technique [0002] Microalloying the weld metal of low-carbon low-alloy steel with titanium (Ti) and boron (B) can make the weld metal obtain very high toughness. Therefore, Ti-B treatment is an important metallurgical means for toughening steel weld metal today. At present, in the application field of welding materials, the method of directly infiltrating a small amount of B into the weld metal by ferroboron alloy is generally used. That is to add iron-boron alloy to the coating of the electrode, the core of the flux-cored wire and the submerged arc welding flux. The metal is infiltrated with a trace amount of boron. In the field of surface chemical heat treatment, boronizing is often used to achieve the purpose of hardening the workpiece. With the advancement of boronizing technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/362B23K35/365B23K35/368B23K9/00
CPCB23K35/362B23K9/00B23K35/365B23K35/368
Inventor 桂赤斌
Owner 江苏立新焊接材料有限公司
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