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High-manganese and high-strength full-austenite welding rod with low thermal crack sensitivity

A crack-sensitive, fully austenitic technology, used in welding media, welding equipment, welding/cutting media/materials, etc., to achieve excellent thermal crack sensitivity, high strength, and outstanding thermal crack sensitivity.

Active Publication Date: 2011-05-18
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there is no case involving the use of high manganese content to solve the hot crack susceptibility of high-strength all-austenitic electrodes by changing the solidification process of the weld

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] Provide specific examples below to further illustrate the present invention:

[0019] Prepare the medicinal powder according to the specified mass ratio, and mix the uniform medicinal powder with SiO 2 =30.6%, KO 2 =3.7%, NaO 2 =8.1%, the modulus is: 3.0M, the amount is 25.6% of the dry powder weight of sodium potassium mixed water glass as adhesive pressure coating on the welding core of the composition listed in Table 1 to make an electrode.

[0020] Table 1 Chemical composition of welding core for welding rod of the present invention

[0021] Solder core

Chemical composition (wt%)

C

Si

mn

Ni

Cr

Mo

N

S

P

Fe

Example 1

0.028

0.97

6.72

18.22

22.41

4.77

0.290

0.0098

0.0077

margin

Example 2

0.022

0.53

7.61

17.43

20.92

4.03

0.276

0.0050

0.0086

margin

Example 3

0.014

0.26

8.46

16...

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Abstract

The invention discloses a high-manganese and high-strength full-austenite welding rod with low thermal crack sensitivity. The core wire of the welding rod is prepared from 0.005-0.03% of C, 0.01-1.0% of Si, 6.5-8.5% of Mn, 16.0-18.5% of Ni, 20.5-22.5% of Cr, 3.0-5.0% of Mo, 0.20-0.30% of N, not more than 0.040% of S+P and the balance of Fe; and a coating comprises 38-42% of marble, 32-38% of fluorite, 4-5% of feldspar, 4-6% of manganese metal, 4-6% of ferrosilicon, 4-6% of ferrotitanium, 2-4% of iron powder, 1-2% of soda ash and 1-2% of carboxymethylcellulose. The weld metal of the welding rod is of a full-austenite structure and has extremely low magnetism, yield strength capable of reaching above 400MPa, tensile strength capable of reaching above 600MPa, good welding manufacturability and particularly outstanding thermal crack resistance sensitivity.

Description

[0001] technical field [0002] The invention relates to a welding material technology, in particular to a high-strength full-austenite electric welding electrode with high manganese and low thermal crack sensitivity. Background technique [0003] Due to the large linear expansion coefficient of austenite, austenitic welding electrodes have always had the problem of high thermal cracking sensitivity. At present, some traditional methods are adopted to solve this problem, such as: changing the composition to produce a certain amount of weld metal The ferrite structure, using ferrite to dissolve more sulfur and phosphorus impurities, reduces the number of low melting point impurities on the grain boundary, thereby improving the hot crack sensitivity. However, ferrite will increase the magnetism of the weld metal, which is not suitable for electrodes with low magnetic requirements; some austenitic electrodes will add an appropriate amount of manganese, and use manganese an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/22
Inventor 彭冀湘杨澍王明林
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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