By Dr Michael Fletcher of Delta Consultants
Design, fabrication, and maintenance practices that can meet exacting purity requirements of ASME 31.3 are crucial to the food, pharmaceutical, and semiconductor industries.
Demands for improvements in piping fabrication quality have risen exponentially in recent years.
Proper preparation can lead to an increase in electrode life and better welds. Optimizing Tungsten Electrode Performance.
While hand grinding can be tolerated in some circumstances, producing welds for safety-critical applications and where weld properties must meet stringent inspection criteria needs a more controlled approach. Following are some tips for optimizing electrode preparation, which can lead to a significant increase in electrode life.
The most versatile technique for producing fusion welds to the highest quality standards
When inert gas shielded arc welding was introduced nearly 60 years ago, few would have imagined the impact the process and in particular the non-consumable electrode version, would have on the fabrication industry world-wide.
World Pipelines Contribution
Joints of high quality between cylindrical sections such as tubes and pipes can only be made by ensuring that: atmospheric gases are eliminated and positive, smooth weld reinforcement is provided.
Maximum levels of oxygen in purge gas will prevent weld underbead discolorization and loss of corrosion resistance.Inert gas purging to prevent discoloring of the weld underbead and loss of corrosion resistance is relatively common during fabrication of stainless steels.
The following Technical Articles are available as 'downloads' to also assist
Tube and Pipe Welding
Welding and Cutting
Help is on Hand for Pipe Welders
Process Industry Informer
Gas Purging for Pipe Welding
Welding & Metal fabrication
Glass Fibre Tape Materials – The Cost-Effective Solution to Weld Backing
Welding & Cutting
Electrode Preparation Prevents Poor Weld Performance
The use of Water Soluble Film for Pipe Purging
Stainless Steel Focus
Keeping it Clean (Welding Titanium in an enclosure)
American Welding Society Journal
Stainless Steel Focus
Prior Electrode Preparation prevents poor Weld Performance