Industry: Oil & Gas (Duplex Pipeline)
Client Challenges:
- Compared with conventional long-distance pipelines, duplex stainless steel has more stringent welding requirements and higher standards for weld performance;
- Traditional GTAW process has difficulty meeting the high-quality requirements of duplex stainless-steel fabrication;
- The ovality of the pipeline is large, thus the bevel preparation and butt-welding processes are difficult;
- The efficiency of stick welding is low and cannot meet the Owner’s requirements;
- Welder shortage.
AWT DPS Solution & Results:
AWT provided a full welding solution for this project, including fully automatic welding equipment (DPS-3G) Semi-automatic welding equipment (TIP TIG), the internal pipe alignment equipment, welding evaluation, welder training, and other on-site technical services.
- High pass rate of on-site fabrication.
The pass rate of X-ray inspection was 99.2%, and the pass rate of ferrite inspection was 100%.
- The weld joints have excellent corrosion resistance and mechanical properties.
All performance indicators of the welded joints met or exceeded design stands and requirements. The corrosion resistance property is more than 5 times the standard requirements. Point corrosion resistance and low temp impact indicators are far superior to traditional welded parts. The quality of automatic TIG welding greatly extends the service life of high-grade pipelines.
- Solved the problem that the pipe ellipse is too large to be welded
Our specially designed and customized internal pipe alignment equipment makes beveling, pairing and fully automatic welding possible.
- High fabrication efficiency
The automatic fabrication efficiency is more than three times that of manual welding, and greatly reduces the labor intensity of personnel.
- Trained a team of welders that can operate the automatic TIG system
Through our welder training and on-site technical support services, a highly-qualified full-automatic welder team was trained. This serves as a foundation for future projects and increases welders’ technical competitiveness.
