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