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PRCI PR-187-821
- Pulsed Gas Metal Arc Welding of API 5LX-80 Pipe
- Report / Survey by Pipeline Research Council International, 01/01/1989
- Publisher: PRCI
$48.00$95.00
L51610e
Microalloying International, Inc.
Need: The high cost of construction of long-distance, cross-country gas pipelines leads to a need for extremely large through-puts to achieve economic viability. This viability can be achieved by a combination of higher operating pressures and larger pipe diameters, both of which can only by accommodated by the use of heavier-wall thickness and/or higher stresses. Pipe steels of the higher-strength, API 5LX-80 grade are commercially available. These steels have outstanding notch and fracture toughness, coupled with their high strength. At the time this program was initiated, there were only a limited number of laboratory reports, and even less field construction data, concerning the weld-ability of this class of line pipe.
Result: This research program was undertaken to investigate the use of the pulsed- gas metal-arc welding (PGMAW) process for the field, girth welding of API 5LX-80 pipe. The specific program objectives were as follows: Determine the optimum shielding in gas, commercial filler wire, and weld procedure for the PGMA girth 5LX -80 pipe welding in the 5G position of API to determine the mechanical properties of PGMA girth welds deposited in five, API 5LX-80 pipes manufactured by different pipe mills.
Benefit: This report summarizes the materials, equipment, and procedures used, the results obtained, a discussion of these results, and conclusions. The PGMAW welding procedures that were developed are considered field-ready and can be used reliably for field, girth-welding operations. The weld metal deposition rates and welding times are equivalent to those obtained with conventional, mechanized, GMAW procedures.
Microalloying International, Inc.
Need: The high cost of construction of long-distance, cross-country gas pipelines leads to a need for extremely large through-puts to achieve economic viability. This viability can be achieved by a combination of higher operating pressures and larger pipe diameters, both of which can only by accommodated by the use of heavier-wall thickness and/or higher stresses. Pipe steels of the higher-strength, API 5LX-80 grade are commercially available. These steels have outstanding notch and fracture toughness, coupled with their high strength. At the time this program was initiated, there were only a limited number of laboratory reports, and even less field construction data, concerning the weld-ability of this class of line pipe.
Result: This research program was undertaken to investigate the use of the pulsed- gas metal-arc welding (PGMAW) process for the field, girth welding of API 5LX-80 pipe. The specific program objectives were as follows: Determine the optimum shielding in gas, commercial filler wire, and weld procedure for the PGMA girth 5LX -80 pipe welding in the 5G position of API to determine the mechanical properties of PGMA girth welds deposited in five, API 5LX-80 pipes manufactured by different pipe mills.
Benefit: This report summarizes the materials, equipment, and procedures used, the results obtained, a discussion of these results, and conclusions. The PGMAW welding procedures that were developed are considered field-ready and can be used reliably for field, girth-welding operations. The weld metal deposition rates and welding times are equivalent to those obtained with conventional, mechanized, GMAW procedures.
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