Transcription of Welding Pressure Pipeliners and Piping Systems
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Welding Pressure Pipeliners and Piping Systems
Welding Pressure . PIPELINES &. Piping Systems . Procedures and Techniques Table of Contents Introduction ..3. Vertical Down vs. Vertical Up ..3-4. Cross Country Pipeline-Vertical Down Welding Joint Preparation ..4. Pipe End Cleaning ..4-5. Welding the Root Pass ..5-6. Current Settings w/Lincoln Engine Driven Welders .6-7. Root Pass Welding ..7. Root Pass Troubleshooting ..7. Techniques for Welding Hot Pass ..8. Techniques for Welding Fill and Cap ..8. Setting the Current etc..8-9. Preventing Cracking ..10. Techniques for X60 etc..10-11. Vertical Down Procedures ..12-13. electrode Consumption ..14-15. Thin Wall Pipe Welding Procedures ..16-20. Double Ending.
• Apply less pressure on the electrode which creates a bigger key-hole. The required current decreases as the gap size increases. If the gap is too narrow, it is not unusual to push so hard on the electrode that a 5/32” (4.0mm) electrode will bend. Sometimes, because of magnetic conditions the arc will tend to push to one side of the joint.
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