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Aluminum Pontoon Boat Repair & TIG Welding Restoration in Central Alberta
- May 27
- 4 min read
Updated: 6 days ago
Some welding and fabrication projects are about restoring appearance. Others are about restoring safety, structural integrity, and reliability.
This aluminum pontoon boat repair project involved diagnosing and repairing multiple leaking pontoons on a Bennington pontoon boat belonging to a customer from Sylvan Lake, Alberta.
Following inspection and pressure testing, failed factory welds were identified across all three pontoons. Cracking and porosity within the original welds had allowed water intrusion into the sealed chambers, compromising flotation performance and the overall integrity of the vessel.
The repair required complete removal of the failed weld sections, precision TIG welding repairs on thin-gauge 2mm marine aluminum, pressure retesting, and modifications to allow easier future inspection and maintenance of the pontoons.
Project Overview
Bennington aluminum pontoon boat repair
Customer located in Sylvan Lake, Alberta
Water intrusion affecting all three pontoons
Failed factory welds identified through pressure testing
Cracking and porosity identified in original aluminum welds
Failed weld material fully removed prior to repair
Precision TIG welding repairs completed on 2mm marine aluminum
Pontoons pressure tested following repairs to confirm watertight integrity
3/4-inch drain bungs installed in each pontoon for future testing and maintenance
Damage Assessment & Inspection
Following the initial inspection, the pontoons were pressure tested to identify the source of the water intrusion and assess the overall condition of the vessel.
Testing confirmed that all three pontoons had failed weld areas in similar locations. Closer inspection revealed cracking and porosity within several of the original factory welds, allowing water to enter the sealed pontoons and compromise their watertight integrity.
Because the failures were occurring within the original weld material itself, the damaged areas could not simply be welded over or patched externally. The failed and contaminated weld sections first had to be completely removed to allow proper preparation and rewelding of the affected seams.
The repair process also required careful control of heat input due to the thin-gauge 2mm marine aluminum used in the pontoons. Excessive heat, poor preparation, or incomplete weld penetration could have further compromised the material or created additional distortion within the repaired areas.
At this stage of the project, the focus was on identifying the full extent of the weld failures, removing all compromised material, and preparing the pontoons for proper TIG welding repairs and final pressure testing.
Aluminum Welding & Repair Challenges
Repairing leaking marine pontoons requires more than simply rewelding visible cracks. In this case, the original failed welds showed contamination and porosity within the factory weld material itself, meaning the affected areas first had to be fully removed and properly prepared before repairs could begin.
Because the pontoons were constructed from thin-gauge 2mm aluminum, controlling heat input throughout the repair process was critical. Excessive heat can easily distort lightweight marine aluminum, affect panel fit-up, or create additional stress within repaired seams.
The repairs were completed using TIG welding to allow precise control over heat, weld penetration, and consistency throughout the repair areas. Particular attention was given to weld preparation, cleanliness, and achieving proper penetration across the repaired seams to restore the watertight integrity of the pontoons.
As with many marine aluminum repairs, a significant part of the project involved balancing structural repair requirements with careful heat management and consistent weld quality to ensure reliable long-term performance in a marine environment.
Repair Process & Pressure Testing
Once the failed weld material had been fully removed, the affected areas were cleaned, prepared, and rewelded using TIG welding techniques suited for thin-gauge marine aluminum.
Particular attention was given to maintaining consistent weld penetration while carefully controlling heat input throughout the repair process. Because the repairs involved sealed flotation chambers, restoring complete watertight integrity across each repaired seam was critical.
Following the welding repairs, the pontoons were pressure tested again to confirm that the leaking areas had been successfully repaired and that the sealed chambers were holding pressure correctly.
As part of the repair process, 3/4-inch drain bungs were also installed into each pontoon to allow easier future inspection, pressure testing, and maintenance if required.
The completed repairs restored the watertight integrity of all three pontoons and allowed the customer to safely return the vessel to service for the summer season.
Final Repair & Completed Outcome
Following completion of the TIG welding repairs and final pressure testing, all three pontoons were successfully restored to a watertight condition.
The repaired weld areas were rechecked to confirm consistent sealing and structural integrity across each repaired seam. By fully removing the failed weld material and properly rewelding the affected areas, the pontoons were returned to reliable operating condition for continued use in a marine environment.
The addition of drain bungs in each pontoon also allows for easier future inspection and pressure testing if required, helping simplify ongoing maintenance and monitoring of the vessel over time.
Projects like this reinforce the importance of proper weld preparation, controlled heat input, and thorough inspection when performing aluminum marine repairs — particularly on thin-gauge flotation chambers where maintaining watertight integrity is critical.
Marine Aluminum Repair Capabilities
Projects like this highlight the importance of proper diagnosis, weld preparation, controlled heat input, and experienced TIG welding when repairing thin-gauge marine aluminum structures.
At CAKI Fabrication Ltd., we complete a wide range of aluminum welding and repair work including marine repairs, custom aluminum fabrication, structural modifications, and specialty TIG welding projects throughout Central Alberta. Learn more about CAKI Fabrication.
Whether repairing damaged aluminum components, addressing failed welds, or completing custom fabrication work, the focus remains the same — quality workmanship, reliable repairs, and practical long-term solutions. Learn more about what affects the lifespan of welding repairs.
Need aluminum welding or marine repair work completed in Central Alberta? Contact CAKI Fabrication Ltd. to discuss your project.
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