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We are a company that can offer services that include welder qualifications,QCP writing visual inspection, in and out of service inspection in tankage and piping
30/07/2015
Over head stick welding have a look
Stick Welding Tips for a 4g Overhead Weld Test visit the store http://weldmongerstore.com/ see a more detailed article on this http://goo.gl/Udqo9y The 4g overhead welding test is often given along with t...
07/07/2015
SAW Girth Welding Machine Suitable for Jacking Bygging - SAW Girth Welding Machine Suitable for Jacking
25/05/2015
Porosity
Porosity is the presence of pockets which do not contain any solid material. They differ from slag inclusions in that the pockets contain gas rather than a solid.
The gases forming the voids are derived form:
Gas released by cooling weld because of its reduced solubility temperature drops.
Gases formed by the chemical reactions in the weld.
Porosity is best prevented by avoiding:
Overheating and undercutting of the weld metal.
Too high a current setting.
Too long an arc.
Undercutting
Undercutting is the burning away of the base metal at the toe of the weld. Undercutting may be caused by the following conditions:
Current adjustment that is too high.
Arc gap that is too long.
Failure to fill up the crater completely with weld metal.
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