Defects In Welding : Porosity

Other Causes:

• Unclean parent metal surface ie. oil, dust, dirt or rust contamination.
• Incorrect electrode for parent metal.
• Inadequate gas shielding of the arc.
• Parent metals with a high percentage of sulphur and phosphorus.

Result: Severely reduces the strength of the welded joint. Surface porosity can allow a corrosive atmosphere to attack the weld metal which may cause failure.

QualityTimes – weld defects – Surface Porosity
quality, quality quotes, quality gurus, ISO 9001, TQM, Six sigma weld defects and radiography interpretation. Restart Porosity: Causes: Unstable arc conditions at weld start,
http://www.qualitytimes.co.in/weld_defects_restart_porosity.htm

Welding-defects: description, search and assessment
Welding-defects: how to look for them. Between discontinuities and defects. Acceptance POROSITY is a condition caused by gases remaining entrapped in the melt.
http://www.welding-advisers.com/Welding-defects.html

welding defects
Any of these defects are potentially disastorous as they can all give ii. Porosity – This occurs when gases are trapped in the solidifying weld metal.
http://www.tech.plym.ac.uk/sme/strc201/wdefects.htm

Miller – The Most Common MIG Weld Defects on Aluminum and
The Most Common MIG Weld Defects on Aluminum and Steel and How to Avoid Them Some of the most common weld defects are porosity, lack of fusion and burn through, with
http://www.millerwelds.com/resources/articles/Common-MIG-Weld-Defects-GMAW/

QualityTimes – weld defects – Uniformly Distributed Porosity
Welding > Procedures > Weld defects > Uniformly Distributed Porosity. weld defects and If the weld wire used contains insufficient deoxidant it is also possible for
http://www.qualitytimes.co.in/weld_defects_uniformly_distributed_porosity.htm

Petrochem Inspector
Weld defects are discontinuities in the weld metal, base metal, or heat affected Porosity in the weld and heat affected zone may lead to cracking.
http://www.petrocheminspector.com/welddefects.html

Common HF Welding Defects
Porosity on the bond plane is the result of high welding temperatures and 1. Most weld defects have their origins in set-up of the mill or weld area.
http://www.thermatool.com/information/papers/quality/COMMON-HF-WELDING-DEFECTS.pdf