Welding Pipeline Handbook
INTRODUCTION .............................................. 3
Joint details .................................................. ........... 4
Joint types .................................................. ............. 5
Electrode positioning angles ................................... 6
Pipe classification .................................................. . 7
Consumption of electrodes ..................................... 11
ASME / EN positions .............................................. 13
THE MANUAL METAL ARC
PROCESS .................................................. ......... 15
General information .............................................. 16
Filler materials .................................................. ...... 17
Pipeweld cellulosic electrodes ................................ 17
Basic electrodes .................................................. .... 19
Basic electrodes - Technical data ............................ 20
Cellulosic electrodes - Technical dfata..................... 22
WELDING TECHNIQUES
AND OPERATIVE PRACTICES ................. 25
General information .............................................. 26
Pipe welding in vertical down (downhill)
with cellulosic electrodes
1 - Preparation and tacking ..................................... 27
2 - Joint in 5G/PG position ...................................... 29
3 - Joint in 6G/H-L045 position ............................... 35
Welding of pipes in vertical up (uphill)
with mixed cellolosic/basic technique
1 - Preparation and tacking ..................................... 38
2 - Joint in 5G/PF position ...................................... 40
3 - Joint in 2G/PC position ...................................... 44
4 - Jioint in 6G/H-L045 position .............................. 47
DEFECTS: CAUSES AND REMEDIES ...... 49
AUTOMATIC PIPE WELDING .................... 53
General information .............................................. 54
Filler materials .................................................. ...... 55
Welding techniques and operational practices ....... 57
Examples of WPS .................................................. . 58
Comparison between three welding methods.......... 62
Defects and remedies ............................................. 63
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