Coating effects on contact conditions in resistance spot weldability

被引：18
|
作者：
Geslain, Edouard [1 ,2 ]
Rogeon, Philippe [1 ]
Pierre, Thomas [1 ]
Pouvreau, Cedric [1 ]
Cretteur, Laurent [2 ]
机构：
[1] Univ Bretagne Sud, FRE CNRS, IRDL, F-56100 Lorient, France
[2] ArcelorMittal Global R&D, F-60761 Montataire, France
来源：
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 2018年 / 253卷
关键词：
Resistance spot welding; Dissymmetric assembly; Electrical contact resistance; Infrared thermography; NUGGET FORMATION; SIMULATION;
D O I：
10.1016/j.jmatprotec.2017.11.009
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An experimental apparatus was designed to reproduce a resistance spot welding operation and allow observation via infrared camera. A specific ex situ device was used to measure the variations of electrical contact resistances, versus pressure and temperature, for the electrode-sheet and sheet sheet interfaces. The high values of the electrical contact resistances associated to the Al-Si coated Press Hardened Steel sheet explains the spark effect observed at these interfaces by infrared thermography. The initiation and the growth of the nugget from the Al-Si coated sheet to the galvanized low carbon thin sheet are also due to these high contact resistances. The different observation methods and measurements concur to explain the nugget formation.
引用
收藏
页码：160 / 167
页数：8
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