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Welding Position
To determine what position(s) a particular electrode is qualified for, refer to the third digit in AWS classification. Here's how you decipher the qualified electrode position:
1 = flat, horizontal, vertical and overhead
2 = flat and horizontal only
For example, a 7018 electrode can be used in the flat, horizontal, vertical and overhead positions.
Specification and Service Conditions
Make sure to assess the conditions that the welded part will encounter throughout its service. If it will be used in high heat or low temperature environments, subjected to repetitive shock loading, a low hydrogen electrode with higher ductility will reduce the chance of weld cracking. Also, be certain to check for welding specifications if you're working on critical applications such as pressure vessel or boiler fabrication. In most cases, these welding specifications will require you to use specific types of electrodes.
Environmental Job Conditions
To achieve the best results, you should always remove excessive mill scale, rust, moisture, paint and grease. Clean base metals help prevent porosity and increase travel speeds. If cleaning your base metal is not possible, E6010 or E6011 electrodes deliver a deep penetrating arc that has the ability to cut through contaminants.
Conclusion
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