Hybrid Laser/Gas Metal Arc Welding (HLAW) of High Strength Steel Gas Transmission Pipelines

EWI has identified innovative welding processes and automation that could be used to develop higher joint completion rates for pipeline welding. These processes include hybrid laser/gas metal arc welding (HLAW), which can be used for high-speed root pass welding on pipe joints with thicker root faces than current production methods allow. Tandem (or dual-tandem) gas metal arc welding (T-GMAW), which can operate at high travel speeds and up to four times the deposition rate of single-wire GMAW processes, has also been developed. T-GMAW can be used for fill pass welding of pipelines once the root pass is completed. In general, these processes are designed to improve metal transfer, minimize spatter, minimize weld defects, and increase productivity. The goal of this project was to develop the HLAW process for on-shore pipeline girth welding and to demonstrate the system under field conditions. Special emphasis was placed on understanding the mechanical properties of HLAW made on X80 and X100 material. Other areas of focus included weld overlaps and general HLAW process phenomena as described in succeeding sections.


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Project Report
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 66p

Subject/Index Terms

Filing Info

  • Accession Number: 01643603
  • Record Type: Publication
  • Report/Paper Numbers: EWI Project No. 50453GTH
  • Contract Numbers: DTPH56-07-T-000003
  • Files: TRIS, ATRI, USDOT
  • Created Date: Aug 9 2017 12:09PM