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 ..20-21. Flux & Electrode Selection ..21. API Pipe Steel ..22-24. Consumables for Welding Pipe ..25. Consumables for High Strength Pipe ..26. Consumables for SMAW ..27-30. Consumables for FCAW ..30. Consumables for GMAW ..31. Pipe Welding Electrodes ..32-33. Mechanical Properties ..34-35. In-Plant Pipe.
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. This is called arc blow. There are two solu-tions to this while welding:
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