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Welding material for ZG40Ni35Cr25NbW

A welding material and welding process technology, applied in the direction of welding/cutting medium/material, welding medium, welding equipment, etc., can solve problems such as unsatisfactory high-temperature mechanical properties of welds, hidden dangers in stability and safety, and achieve superior synergy The effect of function, high temperature mechanical properties, and excellent corrosion resistance

Inactive Publication Date: 2018-08-28
李泳澎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is found in the application that the high temperature mechanical properties of the weld are not ideal
This defect makes the stability and safety of ZG40Ni35Cr25NbW products in high-temperature application environments hidden dangers, thus limiting the application of ZG40Ni35Cr25NbW products in certain high-temperature environments that require mechanical properties

Method used

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  • Welding material for ZG40Ni35Cr25NbW
  • Welding material for ZG40Ni35Cr25NbW

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Two nickel-based rolled plates with a size of 450mm×75mm×20mm were selected as welding samples, and a V-shaped butt groove was adopted. The groove pattern was: the length of the blunt edge was 1mm, and the groove angle was 60°.

[0020] GTAW welding process is used to weld the above-mentioned welding samples; the welding machine model used is WSM-4000 inverter pulse argon arc welding machine; the welding material used is a welding wire with a diameter of φ2.4mm, and its composition is: C 0.03% , Cr 16.8%, Fe7.2%, Mn 0.4%, Nb 2.45%, Si 0.85%, S 0.002%, P 0.002%, Ni balance.

[0021] The connection between the welding machine and the welding sample is direct current connection. The welding process includes the following steps:

[0022] (1) Clean the surface of the groove of the sample to be welded, keep it clean and dry, then connect the groove according to the above-mentioned V-shaped butt joint, fix the position by spot welding, and then pass argon to protect it;

[0023] (2) ...

Embodiment 2

[0026] Two nickel-based pipe sections with specifications of φ120mm (outer diameter) × 15mm (wall thickness) × 150mm (length) are selected as welding samples, and U-shaped butt grooves are used. The groove form is blunt edge length 1mm and radius 4mm. The bevel angle is 25°.

[0027] Using the same welding materials, equipment and welding process as in Example 1, the welding samples were welded. The connection between the welding machine and the welding sample is direct current connection.

[0028] The welding process includes the following steps:

[0029] (1) Clean the surface of the groove of the sample to be welded, keep it clean and dry, then connect the groove according to the above U-shaped butt joint, fix the position by spot welding, and then pass argon to protect it;

[0030] (2) Perform bottom welding on the welding sample, with a welding current of 90A, a voltage of 12V, and a welding speed of about 0.8mm / s, with two layers welded;

[0031] (3) Fill welding and cover weldin...

Embodiment 3

[0032] Example 3 (comparative)

[0033] The welding material in Example 1 was changed to ERNiCr-3 welding wire with a diameter of φ2.4mm, and other conditions remained unchanged.

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Abstract

The invention discloses a welding material for ZG40Ni35Cr25NbW and relates to the field of welding materials. The welding material for ZG40Ni35Cr25NbW is composed of the following chemical componentsof, by mass, no greater than 0.5% of C, 16.0-18.0% of Cr, 6.0-10.0% of Fe, no greater than 1.0% of Mn, 1.5-3.0% of Nb, 0.6-1.0% of Si, no greater than 0.015% of S, no greater than 0.015% of P and no less than 70.0% of Ni. Weld joints prepared from the welding material have good surface appearance and excellent corrosion resistance and normal-temperature mechanical properties, and show obviously-improved high-temperature mechanical properties, the quality of the products can be greatly improved, and the service life of the products can be greatly prolonged.

Description

Technical field [0001] The invention belongs to the technical field of welding materials, and specifically relates to a welding material for ZG40Ni35Cr25NbW. Background technique [0002] The high temperature resistant casting alloy ZG40Ni35Cr25NbW has the following chemical composition (mass percentage): C0.4~0.6%, Cr 15.0~19.0%, Ni 33.0~37.0%, Mo≤0.5%, Mn≤1.5%, Si0.5~2.0% , S≤0.03%, P≤0.03%, Fe margin. The alloy has excellent high temperature corrosion resistance, oxidation resistance and hot and cold processing properties, and is widely used in the petrochemical field. [0003] Alloy applications are inseparable from welding, and the quality of welds is an important factor affecting the overall performance of metal products (such as mechanical properties and corrosion resistance). If the welding material is improperly selected or the quality is not good, the weld will become the "short board" of the overall performance of the product. Therefore, the matching welding materials...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K9/167
CPCB23K35/304B23K9/167B23K35/0261
Inventor 李泳澎
Owner 李泳澎
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