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Sunday, October 18, 2015

Deposition of Welding Electrode

Dear Readers,

During Fabrication and Erection works we used welding electrodes for welding process. This article let us discuss about the weld metal deposition calculation.

Welding Electrodes available in markets are 2.5 mm, 3.15 mm, 4 mm & 5 mm with a length of 350 mm or 450 mm. The size mentioned 2.5 / 3.15 / 4 & 5 mm are only core material i.e excluding coating material. The length mentioned is full length including stub.
For calculation of welding deposition per rod we should know the effective length of Electrode usage. Note that Electrode 100% can not be consumed due to space between welding holder with work piece. Generally 75-100 mm of electrode will not be used depends upon the nature of work. Unused welding electrode including stub length. Industrial practice we used to call it is cut bits. It is shown in below picture.
For calculation purpose of welding deposition per rod we should know the effective length of welding electrode usage.

Effective Length = Length of Electrode - (Stub length + Unused electrode)

Following table shows the welding electrode deposition per rod in grams and number of rod required per kg weld deposition
Above table is calculated based on formula of cylindrical (Volume of Cylinder = Pi X r X r X h) and cut bit is 75 mm. Where "r" is radius of electrode and "h" is length of rod considered as a height

Percentage of efficiency will vary based on type of electrode. For CS Electrode is 100%, If it is Low Hydrogen AS electrode is 108% and If it is  Low Hydrogen CS electrode is 115%. This is due to flux coating material.

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