Ultralow carbon welding rod for welding heat resisting steel and stainless steel

An electric welding rod, ultra-low carbon technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problem of high cost, achieve the effect of preventing carbon migration layer, simple composition design, and excellent metallurgical performance

Inactive Publication Date: 2005-12-14
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods have a common problem: an obvious carbon migration layer is formed on the austenite side or the pearlite side
Such welded joints can prevent carbon migration and meet engineering needs, but the cost of welding and manufacturing is very high

Method used

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  • Ultralow carbon welding rod for welding heat resisting steel and stainless steel
  • Ultralow carbon welding rod for welding heat resisting steel and stainless steel
  • Ultralow carbon welding rod for welding heat resisting steel and stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1 Tube-to-tube butt joint. The specification of the pipe material is Φ64×5, and the length is 200 mm; the bevel is opened, and the welding electrode of the present invention is dried at 350° C. for 1 hour before welding. Welding parameters: use Φ3.2 welding rod, welding current is 90-120 amps, welding voltage is 23-25 ​​volts, welding two layers and two layers. At the same time, E347-17 and E5515-B2-V electrodes were used to weld the comparison specimens of the same base metal respectively.

[0013] For pipe fittings welded with three kinds of electrodes, the metallographic photos of the carbon element scanning near the fusion zone on the side of the austenite base metal are shown in figure 1 , figure 2 , image 3 . Depend on figure 1 It is shown that the content of carbon elements on both sides of the fusion zone is balanced, and there is no carbon migration layer, while figure 2 and image 3 Both showed a carbon migration layer.

[0014] The normal t...

Embodiment 2

[0016] Embodiment 2 Plate docking. The size of the welding plate used is 300×100 mm, the thickness is 16 mm, and the bevel is 60°. The electric rod of the present invention and the E5515-B2-V electrode are used for multi-layer and multi-pass welding, and the high-temperature tensile test of the deposited metal of the welded joint is completed on a Gleeble 1500 thermal simulation testing machine. The test results are shown in Table 2. With the microhardness test near the fusion zone of the plate joint welded by the welding rod of the present invention, the method of taking points across the fusion line line is adopted, and the test line is 8 millimeters away from the upper surface of the test plate, and the distance between the test points is 0.05 millimeters. The test results are shown in the table 3.

[0017] sample

[0018] test

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Abstract

The present invention belongs to the field of welding material technology, and is welding rod for welding joint of different kinds of steel, especially of heat resistant pearlite steel and stainless steel. The ultralow carbon welding rod of the present invention consists of: C 0.03-0.06 wt%, Si 0.2-0.5 wt%, Mn 0.5-0.8 wt%, Cr 1.5-2.5 wt%, Mo 0.4-0.65 wt% and V 0.10-0.35 wt%, except Fe. Compared with available technology, the present invention has simple and reasonable component design, capacity of effectively preventing the formation of the carbon immigrating layer in fusion area of joint, no martensite structure formed in the joint, excellent welding performance and high normal temperature and high temperature performance of the welded joint.

Description

technical field [0001] The invention belongs to the field of welding materials. Especially the welding electrodes used for welding dissimilar steel joints are mainly suitable for welding of pearlitic heat-resistant steel and austenitic stainless steel dissimilar steel. Background technique [0002] Pearlitic heat-resistant steel (such as 12Cr1MoV) has excellent high-temperature strength, and austenitic stainless steel (1Cr18Ni9) has corrosion resistance, which can meet the different requirements of thermoelectric equipment for materials, and are widely used in various heat-resistant and corrosion-resistant materials. environment. Especially in the construction of power station equipment, such welded joints between dissimilar materials are often used when boilers and gas turbines are connected to external piping. In the past, one of the following methods was used for welding, and there were different problems: Welding with ferrite or pearlite welding materials (such as E551...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/22
Inventor 李德元董晓强张义顺张忠礼
Owner SHENYANG POLYTECHNIC UNIV
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