Prediction and stabilization of initial resistance between electrodes for small-scale resistance spot welding

Eldos Zh Akbolatov, Alexey S. Kiselev, Mikhail S. Slobodyan

Research output: Contribution to journalArticle

Abstract

Quality of resistance spot-welded joints depends on Joule’s heat generation and, in turn, a current profile, dynamic resistance change, and its initial value. In the present work, the impact of electrode force and dome radius of hemispherical electrodes on initial resistance between electrodes was investigated. Two combinations of workpieces of zirconium alloy thickness of 0.25 + 0.25 mm and austenitic stainless steel thickness of 0.3 + 0.3 mm were used. The experimental results obtained were compared with calculated values using published equations and data on physical properties of these materials. After that, the possibility of stabilization resistance between electrodes by preheating current pulses was studied. The pulses had different algorithms of current rise: discrete and stepwise, as well as sharp and smooth with longer upslope. The results show impossibility of reliable prediction and absolute stabilization of initial values of resistance between electrodes. No clear relationship between these values and electrode force has been found. An increase in dome radius of hemispherical electrodes reduces mean resistance values for zirconium alloy but has no effect for stainless steel. Also, it does not affect dispersion of values for both materials. The rate of preheating current rise has no appreciable effect on stabilization of resistance between electrodes in all cases. Stepwise current rise significantly reduces dispersion of resistance values for zirconium alloy but has no effect for stainless steel. However, their dispersion significantly decreases after preheating in comparison with initial values.

Original languageEnglish
Pages (from-to)443-457
Number of pages15
JournalWelding in the World
Volume63
Issue number2
DOIs
Publication statusPublished - 8 Mar 2019

Fingerprint

Resistance welding
Spot welding
Stabilization
Electrodes
Zirconium alloys
Preheating
Stainless Steel
Domes
Stainless steel
Heat generation
Austenitic stainless steel
Welds
Physical properties

Keywords

  • Analysis techniques
  • Austenitic stainless steels
  • Contact resistance
  • Resistance spot welding
  • Zirconium alloys

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

Cite this

Prediction and stabilization of initial resistance between electrodes for small-scale resistance spot welding. / Akbolatov, Eldos Zh; Kiselev, Alexey S.; Slobodyan, Mikhail S.

In: Welding in the World, Vol. 63, No. 2, 08.03.2019, p. 443-457.

Research output: Contribution to journalArticle

@article{e8020e4d2fc94dfe8bf947310b8a62cb,
title = "Prediction and stabilization of initial resistance between electrodes for small-scale resistance spot welding",
abstract = "Quality of resistance spot-welded joints depends on Joule’s heat generation and, in turn, a current profile, dynamic resistance change, and its initial value. In the present work, the impact of electrode force and dome radius of hemispherical electrodes on initial resistance between electrodes was investigated. Two combinations of workpieces of zirconium alloy thickness of 0.25 + 0.25 mm and austenitic stainless steel thickness of 0.3 + 0.3 mm were used. The experimental results obtained were compared with calculated values using published equations and data on physical properties of these materials. After that, the possibility of stabilization resistance between electrodes by preheating current pulses was studied. The pulses had different algorithms of current rise: discrete and stepwise, as well as sharp and smooth with longer upslope. The results show impossibility of reliable prediction and absolute stabilization of initial values of resistance between electrodes. No clear relationship between these values and electrode force has been found. An increase in dome radius of hemispherical electrodes reduces mean resistance values for zirconium alloy but has no effect for stainless steel. Also, it does not affect dispersion of values for both materials. The rate of preheating current rise has no appreciable effect on stabilization of resistance between electrodes in all cases. Stepwise current rise significantly reduces dispersion of resistance values for zirconium alloy but has no effect for stainless steel. However, their dispersion significantly decreases after preheating in comparison with initial values.",
keywords = "Analysis techniques, Austenitic stainless steels, Contact resistance, Resistance spot welding, Zirconium alloys",
author = "Akbolatov, {Eldos Zh} and Kiselev, {Alexey S.} and Slobodyan, {Mikhail S.}",
year = "2019",
month = "3",
day = "8",
doi = "10.1007/s40194-018-0671-x",
language = "English",
volume = "63",
pages = "443--457",
journal = "Welding in the World, Le Soudage Dans Le Monde",
issn = "0043-2288",
publisher = "Institut International de la Soudure",
number = "2",

}

TY - JOUR

T1 - Prediction and stabilization of initial resistance between electrodes for small-scale resistance spot welding

AU - Akbolatov, Eldos Zh

AU - Kiselev, Alexey S.

AU - Slobodyan, Mikhail S.

PY - 2019/3/8

Y1 - 2019/3/8

N2 - Quality of resistance spot-welded joints depends on Joule’s heat generation and, in turn, a current profile, dynamic resistance change, and its initial value. In the present work, the impact of electrode force and dome radius of hemispherical electrodes on initial resistance between electrodes was investigated. Two combinations of workpieces of zirconium alloy thickness of 0.25 + 0.25 mm and austenitic stainless steel thickness of 0.3 + 0.3 mm were used. The experimental results obtained were compared with calculated values using published equations and data on physical properties of these materials. After that, the possibility of stabilization resistance between electrodes by preheating current pulses was studied. The pulses had different algorithms of current rise: discrete and stepwise, as well as sharp and smooth with longer upslope. The results show impossibility of reliable prediction and absolute stabilization of initial values of resistance between electrodes. No clear relationship between these values and electrode force has been found. An increase in dome radius of hemispherical electrodes reduces mean resistance values for zirconium alloy but has no effect for stainless steel. Also, it does not affect dispersion of values for both materials. The rate of preheating current rise has no appreciable effect on stabilization of resistance between electrodes in all cases. Stepwise current rise significantly reduces dispersion of resistance values for zirconium alloy but has no effect for stainless steel. However, their dispersion significantly decreases after preheating in comparison with initial values.

AB - Quality of resistance spot-welded joints depends on Joule’s heat generation and, in turn, a current profile, dynamic resistance change, and its initial value. In the present work, the impact of electrode force and dome radius of hemispherical electrodes on initial resistance between electrodes was investigated. Two combinations of workpieces of zirconium alloy thickness of 0.25 + 0.25 mm and austenitic stainless steel thickness of 0.3 + 0.3 mm were used. The experimental results obtained were compared with calculated values using published equations and data on physical properties of these materials. After that, the possibility of stabilization resistance between electrodes by preheating current pulses was studied. The pulses had different algorithms of current rise: discrete and stepwise, as well as sharp and smooth with longer upslope. The results show impossibility of reliable prediction and absolute stabilization of initial values of resistance between electrodes. No clear relationship between these values and electrode force has been found. An increase in dome radius of hemispherical electrodes reduces mean resistance values for zirconium alloy but has no effect for stainless steel. Also, it does not affect dispersion of values for both materials. The rate of preheating current rise has no appreciable effect on stabilization of resistance between electrodes in all cases. Stepwise current rise significantly reduces dispersion of resistance values for zirconium alloy but has no effect for stainless steel. However, their dispersion significantly decreases after preheating in comparison with initial values.

KW - Analysis techniques

KW - Austenitic stainless steels

KW - Contact resistance

KW - Resistance spot welding

KW - Zirconium alloys

UR - http://www.scopus.com/inward/record.url?scp=85063294656&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85063294656&partnerID=8YFLogxK

U2 - 10.1007/s40194-018-0671-x

DO - 10.1007/s40194-018-0671-x

M3 - Article

VL - 63

SP - 443

EP - 457

JO - Welding in the World, Le Soudage Dans Le Monde

JF - Welding in the World, Le Soudage Dans Le Monde

SN - 0043-2288

IS - 2

ER -