Dissimilar metal welding method for martensite heat-resisting steel and high-temperature nickel base alloy

A nickel-based alloy and welding method technology, which is applied in the field of dissimilar metal welding of martensitic heat-resistant steel and high-temperature nickel-based alloys, can solve problems such as lagging and restricting the design, manufacture and safe operation of ultra-supercritical units, and achieve control Less parameters, lower welding cost, and easy mechanization

Inactive Publication Date: 2014-09-03
XIAN SPECIAL EQUIP INSPECTION INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, my country's research on dissimilar metal welding technology for martensitic heat-resistant steel and high-temperature nickel-based alloys is far behind that of Europe, America and Japan. The technical d

Method used

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  • Dissimilar metal welding method for martensite heat-resisting steel and high-temperature nickel base alloy
  • Dissimilar metal welding method for martensite heat-resisting steel and high-temperature nickel base alloy
  • Dissimilar metal welding method for martensite heat-resisting steel and high-temperature nickel base alloy

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Experimental program
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Embodiment 1

[0036] The martensitic heat-resistant steel is selected from the T92 steel pipe produced by Shanghai Baosteel. The high-temperature nickel-based alloy is selected from the Incoloy 800H alloy pipe imported from the United States. The outer diameter of the T92 steel pipe is 45mm and the thickness is 9mm. The outer diameter of the Incoloy 800H alloy pipe is It is 45mm, the thickness is 9mm, and the length of the two kinds of steel pipes is 0.15m. Before welding, the welding surface of steel pipe and alloy pipe should be kept clean and cannot be polluted.

[0037]The continuous drive friction welding machine used meets the following performance requirements: the friction process can achieve bipolar pressure, the first stage of pressure, the speed meets (0-1500) rpm, the friction pressure meets (0-50) MPa, and the friction time meets (0-3) seconds, two-stage pressurization stage, speed meets (0-1500) rpm, friction pressure meets (0-100) MPa, friction time meets (0-10) seconds, upse...

Embodiment 2

[0045] Follow the steps below welding T91 Steel pipe and Incoloy 800H alloy pipe

[0046] 1) According to the technical requirements of the friction welding machine, install the T91 steel pipe and the Incoloy 800H alloy pipe respectively. The friction welding machine fixture clamps the steel pipe and the alloy pipe. The T91 steel pipe and the Incoloy 800H alloy pipe cannot shake. The center line of the steel pipe and the alloy pipe stay on a horizontal line;

[0047] 2) In the first stage of pressurization, the speed is 1500 rpm, the friction pressure is 50MPa, and the friction time is 3 seconds;

[0048] 3) In the second stage of pressurization, the speed is 1200 rpm, the friction pressure is 50MPa, and the friction deformation is 2-4mm;

[0049] 4) In the upsetting stage, the upsetting pressure is 100MPa, and the upsetting time is 2 seconds;

[0050] 5) The welded joints of martensitic heat-resistant steel pipes and high-temperature nickel-based alloy pipes need to unde...

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Abstract

A dissimilar metal welding method for martensite heat-resisting steel and high-temperature nickel base alloy includes the following steps that (1) according to technical requirements of a friction welding machine, a martensite heat-resisting steel tube and a high-temperature nickel base alloy tube are respectively installed and clamped through a fixture of the friction welding machine and cannot shake, and the center line of the martensite heat-resisting steel tube and the center line of the high-temperature nickel base alloy tube are kept in the same horizontal line; (2) at a first-level pressurization stage, the rotation speed is 1200-1500 revolutions per minute, friction pressure is 20-50 MPa, and friction time is 1-3 seconds; (3) at a second-level pressurization stage, the rotation speed is 1200-1500 revolutions per minute, friction pressure is 50-100 MPa, friction deformation is 1-4 mm, and friction time is shorter than 10 seconds; (4) at an upset forging stage, upset forging pressure is 100-200 MPa, and upset forging time is 2-4 seconds; (5) partial heat treatment needs to be carried out on a welded joint between the martensite heat-resisting steel tube and the high-temperature nickel base alloy tube after welding, so that residual stress is eliminated. The method has the advantages that quality of the joints is high, the method is suitable for welding of heterogeneous materials, production efficiency is high production cost is low, energy is saved, and environment is protected.

Description

technical field [0001] The invention belongs to the technical field of dissimilar metal welding of ultra-supercritical units, and in particular relates to a method for welding dissimilar metals of martensitic heat-resistant steel and high-temperature nickel-based alloys. Background technique [0002] Ultra-supercritical unit (Ultra-supercritical USC), as the world's most advanced clean coal power generation technology, has become an inevitable trend of thermal power generation in my country at present and in the future with its advantages of high efficiency, environmental protection and energy saving. According to incomplete statistics, there are nearly 50 ultra-supercritical (USC) units under construction and planned in my country, with a capacity of 600MW and 1000MW. These units have been put into operation since 2007, and my country has become the world's The country with the most USC crews in the world. One of the key technologies for the development of USC units is the ...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/227C21D9/50
CPCB23K20/122B23K20/227B23K2101/06B23K2103/18C21D9/50
Inventor 鲁元杨玉山韩建军荆强征杨旭贠柯丁勇
Owner XIAN SPECIAL EQUIP INSPECTION INST
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