This technical bulletin was developed in response to a significant number of manual girth weld failures in newly constructed pipelines. These failures are associated with some systemic deficiencies in current practices, and thus require immediate…
This project evaluated using higher strength E8010 electrodes for root pass welding on modern X70 strength line pipe, as part of a solution to increase overall weld strength, to match or overmatch the actual strength of the line pipe. The…
This Milestone Deliverable M02-T04 is draft guidance for the application of higher strength E8010 electrodes for root pass welding. The guidance discusses E8010 root pass weldability, operability, and productivity, and provides recommended…
The primary objectives of this program were to establish baseline weld metal mechanical property measurements for welding X-80 pipelines and tie-ins using commercially available cellulosic SMAW, basic SMAW, FCAW-S, and mechanized GMAW consumables.…
As part of a larger, DoT-sponsored program to develop optimized weld metal chemistries for X80 and X100, a finite-element approach was used to predict weld metal cooling rates and to provide a better understanding of the factors which influence them.…
There is a concern that there may be areas of low toughness in the seam welds of submerged arc welded linepipe. These are typically associated with the Coarse Grained Heat Affected Zone (CGHAZ), and manifest themselves through low values obtained in…
An experimental program has been conducted to quantify the failure characteristics and flaw tolerance levels of pipeline girth welds made in large diameter pipes of API 5L X 80 quality. The test programme was designed such as to verify whether, in…
Technology development for welding an X100 pipeline has the aim of reducing the capital expenditure required to build new, long distance pipelines. The results from the proposed project will specifically highlight, through a validated database of…
High productivity mechanized welding processes, such as variants of multi-wire pulsed-gas metal arc welding (GMAW-P) have become increasingly popular due to their high production rates. Compared to the conventional single-wire GMAW processes, the…
This investigation is part of a major consolidated program of research that was launched to address key research gaps related to welding of high strength pipe which is an integral part of pipeline design and construction. The two research focus areas…