Characterization of cold lap defects in tandem arc MAG welding
Artikel i övriga tidskrifter, 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.

MAG welding

Voltage

Tandem welding

Defects

Speed

Wire feed

Oxides

Spatter

Arc welding

Lack of fusion

High strength steels

Structural steels

Process parameters

Low alloy steels

Författare

P. Li

Hogskolan Vast

L. E. Svensson

Hogskolan Vast

Per Nylén

Hogskolan Vast

N. Markocsan

Hogskolan Vast

Uta Klement

Chalmers, Material- och tillverkningsteknik, Tillverkningsteknik

Rivista Italiana della Saldatura

0035-6794 (ISSN)

Vol. 65 761-769

Ämneskategorier

Metallurgi och metalliska material