Influence of shielding gases on preheat produced in surface coatings incorporating SiC particulates into microalloy steel using TIG technique

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Abstract

The use of a tungsten inert gas (TIG) welding torch has resulted in the development of an economical route for surface engineering of alloys, giving similar results to the more expensive high power laser. Due to the preheating generated by both techniques, the extent of the temperature rise is sufficient to produce significant changes to the melt dimensions, microstructure and properties between the first and last tracks melted during the coating of a complete surface.
The present study examines if similar changes can occur between the start and finish locations of a single track of 50 mm length. The results show that for a TIG melted surface of a microalloy steel substrate, with or without incorporating preplaced SiC particles, in either argon or argon-helium environments, a maximum temperature of 375°C developed in the second third of the track. Even over this short distance, a hardness decrease of >300 Hv was recorded in the re-solidified SiC coated substrate melt zone, microstructure of a cast iron with cracks were observed. Also porosity was found in all the tracks, with and without preplaced SiC powders.
LanguageEnglish
Pages1506-1514
Number of pages14
JournalMaterials Science and Technology
Volume30
Issue number12
Early online date14 Dec 2013
DOIs
Publication statusPublished - Oct 2014

Fingerprint

Noble Gases
Tungsten
Steel
Inert gases
Shielding
particulates
shielding
rare gases
tungsten
Argon
Gases
steels
coatings
Coatings
gases
Inert gas welding
Helium
Microstructure
Preheating
High power lasers

Keywords

  • coating
  • steel
  • SiC powder
  • TIG torch
  • shielding gas
  • preheating
  • microstructure
  • hardness

Cite this

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title = "Influence of shielding gases on preheat produced in surface coatings incorporating SiC particulates into microalloy steel using TIG technique",
abstract = "The use of a tungsten inert gas (TIG) welding torch has resulted in the development of an economical route for surface engineering of alloys, giving similar results to the more expensive high power laser. Due to the preheating generated by both techniques, the extent of the temperature rise is sufficient to produce significant changes to the melt dimensions, microstructure and properties between the first and last tracks melted during the coating of a complete surface.The present study examines if similar changes can occur between the start and finish locations of a single track of 50 mm length. The results show that for a TIG melted surface of a microalloy steel substrate, with or without incorporating preplaced SiC particles, in either argon or argon-helium environments, a maximum temperature of 375°C developed in the second third of the track. Even over this short distance, a hardness decrease of >300 Hv was recorded in the re-solidified SiC coated substrate melt zone, microstructure of a cast iron with cracks were observed. Also porosity was found in all the tracks, with and without preplaced SiC powders.",
keywords = "coating, steel, SiC powder, TIG torch, shielding gas, preheating, microstructure, hardness",
author = "P Patel and Shahjahan Mridha and neville Baker",
year = "2014",
month = "10",
doi = "10.1179/1743284713Y.0000000481",
language = "English",
volume = "30",
pages = "1506--1514",
journal = "Materials Science and Technology",
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T1 - Influence of shielding gases on preheat produced in surface coatings incorporating SiC particulates into microalloy steel using TIG technique

AU - Patel, P

AU - Mridha, Shahjahan

AU - Baker, neville

PY - 2014/10

Y1 - 2014/10

N2 - The use of a tungsten inert gas (TIG) welding torch has resulted in the development of an economical route for surface engineering of alloys, giving similar results to the more expensive high power laser. Due to the preheating generated by both techniques, the extent of the temperature rise is sufficient to produce significant changes to the melt dimensions, microstructure and properties between the first and last tracks melted during the coating of a complete surface.The present study examines if similar changes can occur between the start and finish locations of a single track of 50 mm length. The results show that for a TIG melted surface of a microalloy steel substrate, with or without incorporating preplaced SiC particles, in either argon or argon-helium environments, a maximum temperature of 375°C developed in the second third of the track. Even over this short distance, a hardness decrease of >300 Hv was recorded in the re-solidified SiC coated substrate melt zone, microstructure of a cast iron with cracks were observed. Also porosity was found in all the tracks, with and without preplaced SiC powders.

AB - The use of a tungsten inert gas (TIG) welding torch has resulted in the development of an economical route for surface engineering of alloys, giving similar results to the more expensive high power laser. Due to the preheating generated by both techniques, the extent of the temperature rise is sufficient to produce significant changes to the melt dimensions, microstructure and properties between the first and last tracks melted during the coating of a complete surface.The present study examines if similar changes can occur between the start and finish locations of a single track of 50 mm length. The results show that for a TIG melted surface of a microalloy steel substrate, with or without incorporating preplaced SiC particles, in either argon or argon-helium environments, a maximum temperature of 375°C developed in the second third of the track. Even over this short distance, a hardness decrease of >300 Hv was recorded in the re-solidified SiC coated substrate melt zone, microstructure of a cast iron with cracks were observed. Also porosity was found in all the tracks, with and without preplaced SiC powders.

KW - coating

KW - steel

KW - SiC powder

KW - TIG torch

KW - shielding gas

KW - preheating

KW - microstructure

KW - hardness

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U2 - 10.1179/1743284713Y.0000000481

DO - 10.1179/1743284713Y.0000000481

M3 - Article

VL - 30

SP - 1506

EP - 1514

JO - Materials Science and Technology

T2 - Materials Science and Technology

JF - Materials Science and Technology

SN - 0267-0836

IS - 12

ER -