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Core rod surfacing repair method and core rod surfacing layer tissue structure

A repair method and mandrel technology, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problems of peeling off of wear-resistant working layer, poor weldability, poor bonding force between matrix and surfacing layer, etc., to improve the bonding force. Effect

Inactive Publication Date: 2019-01-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the carbon content of the mandrel material is high, the weldability is poor, welding crack defects are prone to appear during welding, and the bonding force between the substrate and the surfacing layer is poor, which will cause the wear-resistant working layer to peel off during the rolling process

Method used

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  • Core rod surfacing repair method and core rod surfacing layer tissue structure
  • Core rod surfacing repair method and core rod surfacing layer tissue structure
  • Core rod surfacing repair method and core rod surfacing layer tissue structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of primer

[0031]The composition of the flux-cored wire used for the bottom layer (mass percentage of elements, wt%): C 0.05%, Si 0.70%, Mn0.90%, Cr18.00%, Mo0.38%, V 0.03%, Ni 0.75%, and the rest are Fe. The preheating temperature is determined to be 250°C, the interpass temperature is controlled at 250°C, the wire diameter is 1.2mm, the welding current is 140A, the arc voltage is 25V, the welding speed is 5mm / s, and the polarity of the power supply is DC reversed.

[0032] (2) Preparation of wear-resistant layer

[0033] The composition of the flux-cored wire used in the wear-resistant layer (mass percentage of elements, wt%): C0.07%, Si 0.40%, Mn1.00%, Cr 13.50%, Mo 0.30%, V 0.06%, Ni 1.15%, and the rest are Fe. The preheating temperature is determined to be 250°C, the interpass temperature is controlled at 250°C, the wire diameter is 1.2mm, the welding current is 140A, the arc voltage is 25V, the welding speed is 5mm / s, and the polarity of the po...

Embodiment 2

[0035] (1) Preparation of primer

[0036] The composition of the flux-cored wire used for the bottom layer (mass percentage of elements, wt%): C 0.10%, Si 0.45%, Mn1.30%, Cr13.00%, Mo0.09%, V 0.07%, Ni 1.30%, the rest is Fe. The preheating temperature is determined to be 300°C, the interpass temperature is controlled at 200°C, the wire diameter is 1.0mm, the welding current is 100A, the arc voltage is 15V, the welding speed is 10mm / s, and the polarity of the power supply is DC reversed.

[0037] (2) Preparation of wear-resistant layer

[0038] The composition of the flux-cored wire used in the wear-resistant layer (mass percentage of elements, wt%): C0.03%, Si 0.60%, Mn1.35%, Cr 9.50%, Mo 0.65%, V 0.15%, Ni 1.80%, the rest is Fe. The preheating temperature is determined to be 300°C, the interpass temperature is controlled at 250°C, the wire diameter is 1.5mm, the welding current is 120A, the arc voltage is 20V, the welding speed is 5mm / s, and the polarity of the power suppl...

Embodiment 3

[0040] (1) Preparation of primer

[0041] The composition of the flux-cored wire used for the bottom layer (mass percentage of elements, wt%): C 0.08%, Si 0.50%, Mn1.10%, Cr15.00%, Mo0.20%, V 0.05%, Ni 1.2%, and the rest are Fe. The preheating temperature is determined to be 280°C, the interpass temperature is controlled at 200°C, the wire diameter is 1.5mm, the welding current is 150A, the arc voltage is 30V, the welding speed is 10mm / s, and the polarity of the power supply is DC reversed.

[0042] (2) Preparation of wear-resistant layer

[0043] The composition of the flux-cored wire used in the wear-resistant layer (mass percentage of elements, wt%): C0.04%, Si 0.50%, Mn1.20%, Cr 10.50%, Mo 0.50%, V 0.10%, Ni 1.16%, and the rest are Fe. The preheating temperature is determined to be 300°C, the interpass temperature is controlled at 220°C, the wire diameter is 1.0mm, the welding current is 120A, the arc voltage is 15V, the welding speed is 10mm / s, and the polarity of the ...

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Abstract

The invention discloses a core rod surfacing repair method and a core rod surfacing layer tissue structure. The core rod surfacing repair method repairs a failed core rod through flux-cored wire surfacing, improves the bonding force between a substrate and a surfacing layer, ensures that the surface of a wear layer has high hardness and excellent wear resistance, thereby obtaining a surfacing layer tissue structure of base + underlayer + wear layer mode meeting the performance requirements of the core rod. Besides, the underlayer metallographic tissue is composed of a large amount of ferrite +lower bainite + carbide, thus having good plastic toughness, being conductive to preventing the occurrence of hot cracks, being suitable for surfacing of a workpiece surface subjected to strong impact load or surfacing of a transition layer before hard surface surfacing. The wear-resistant layer tissue consists of martensite + retained austenite + carbide, thus being beneficial to the improvementof surface hardness and wear resistance, and fully meeting the comprehensive service performance requirements of the core rod from the substrate to the surface.

Description

technical field [0001] The invention belongs to the technical field of welding machines, and more specifically relates to a design of the structure of the surfacing layer of mandrel rods, specifically repairing failed mandrels with submerged arc welding technology through flux-cored welding wires, and designing mandrel surfacing welding layer organization. Background technique [0002] The mandrel is an important tool for the production of seamless steel pipes, and plays a role in supporting the deformation of the steel pipes during the production process. The quality of the mandrel directly determines the production efficiency of the enterprise, the surface quality of the steel pipe and the production cost. More than 50% of the production and maintenance costs of the continuous rolling mill equipment are used for the consumption and replacement of mandrels. The low service life of the mandrel on the machine is a major technical problem that is common in my country's iron ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K35/22B23K35/30
CPCB23K9/04B23K9/048B23K35/22B23K35/30B23K35/3053
Inventor 胡文彬王心悦高志明田秋成
Owner TIANJIN UNIV
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