·Table of Contents

Lack of fusion in welded joints

Gabriel RIHAR
Welding Institute, Ptujska 19, SI-1000 Ljubljana


1 Introduction

2 Definition of lack of fusion

3 Characteristics of lack of fusion

4 Location of lack-of-fusion defects

5 Detection of lack of fusion by non-destructive testing methods

6 Non-destructive testing methods for the detection of lack of fusion

7 Conclusions


  1. N. Yamauchi, Y. Inaba, T. Taka: Formation Mechanism of Lack of Fusion in MAG Welding. IIW Doc. 212-529-82. International Institute of Welding, 1982.
  2. Causes for Weld Defects. IIW Doc. XII-B-046-83. International Institute of Welding, 1983.
  3. Gas-shielded Metal-Arc Welding of Steel. Directions for Execution of Process. Avoidance of Lack of Fusion. IIW Doc. XII-B-049-83. International Institute of Welding, 1983.
  4. R. Killing and H. Hantsch: Beitrag zur Frage der Bindefehlerempfindlichkeit beim Metall-Aktivgasschweißen mit Fülldrahtelektroden. Schweißen und Schneiden, 45 (1993) 12, 689-693.
  5. Multilingual Collection of Terms for Welding and Allied Processes / International Institute of Welding. Part 1. General Terms. Institut za varilstvo, Ljubljana, 1988.
  6. EN 26520: Classification of imperfections in metallic fusion welds, with explanations.

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