Abstract:
The purpose of this study is to identify which of the two welding techniques
used in GMAW produces the most porosity when welding carbon steel, and to
determine whether welding technique is a vital factor when trying to avoid porosity
formation when welding carbon steel. The test specimens were single groove joined,
produced by welding using the GMAW robot. Radiography testing was used to
detect the formation of porosity inside the welds. The test results show that only the
backhand welded specimens contain porosity while the porosity inside the forehand
welded specimens are negligible, as they are not caused by the welding technique, or
none at all. This shows that the backhand welding technique is more prone to
porosity but may be easily corrected, and both welding techniques are acceptable
when welding carbon steel using the GMAW process. This study may be further
continued by including more variables such as welding in different positions, and
using different welding processes so a more in-depth, and accurate conclusion can be
achieved on the subject.
