Characterization of cold lap defects in tandem arc MAG welding
Journal article, 2013

The objective of this investigation was to classify and characterize the small lack of fusion defects, called cold lap, located at the weld toe. Since the defects are very small (0.01-1.5 mm) and difficult to detect by NDT methods, a better understanding of the formation mechanism is required to be able to avoid their formation. The investigation consisted of two parts. Firstly, a study was made on the type and frequency of cold laps. Three types were identified, namely "spatter cold lap", and "overlap cold lap" and "spatter-overlap cold lap". No relation between type or frequency of cold laps and the welding parameters could be established. Secondly, the interface between spatter and the base material was investigated using optical and scanning electron microscopy, to better understand the cold lap formation mechanism. Manganese-silicate particles were found in the interface located in such a way that they may assist cold lap formation.

Wire feed

Process parameters

MAG welding

Spatter

Low alloy steels

Structural steels

Tandem welding

Defects

Speed

High strength steels

Lack of fusion

Voltage

Oxides

Arc welding

Author

P. Li

University West

L. E. Svensson

University West

Per Nylén

University West

N. Markocsan

University West

Uta Klement

Chalmers, Materials and Manufacturing Technology, Manufacturing Technology

Other publications Research

Rivista Italiana della Saldatura

0035-6794 (ISSN)

Vol. 65 5 761-769

Subject Categories

Metallurgy and Metallic Materials

More information

Latest update

2/18/2021

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