TECHNO-WELD is a proprietary alloy based on mainly zinc, with additions of Aluminium, copper, manganese, magnesium, and other metals. Joints may show a weak bond if excessive silicone is present in the base metal.
is recommended for the joint, since fluxing will remove the trace elements that align the dendrite structure before the bond is complete. Do not use a deoxidiser on this product. Pulsation resistance welding will allow a controlled heating of the joint.
was undertaken by Reynolds Aluminium, and was tested on both 3003-H14 and 1100-H14 Aluminium. T joins were made by using 2 sheets of 0.01" x 2 x 3" and were subjected to a continuous 5% salt spray test. No failure was observed after 500 hrs.
is dependent upon the surrounding environment. When tested on the Eastern Seaboard, Long Island, NY, the penetration rate reached 0.000762 mm per year. Near very heavy Industrial operations, the penetration was magnified to 0.00173mm per year.
This material is expected to perform safely wherever zinc or zinc coated steel has been used in the past with success.
Several socket joints were made to simulate return bends used in practice for 3/8" dia., .89mm wall Aluminium tubing. They had a nominal 1/4" joint length. They were subjected to 720 hrs. in a controlled humidity cabinet (100% relative humidity) at 65.5°C with no visible signs of corrosion.
Endurance limit on a 1/4" section showed a limit of 8500 psi at 100 million cycles.
Lap joins were made from 2 sheets of 1/8" thickness Aluminium, 5" long and 2" wide. Using a Tinius Olsen Tensile Strength Machine, the following results were obtained:
- 28kg sheer strength for 1.27mm x 50.8mm lap (28kg for .05" lap)
- After 48 hrs in flowing synthetic tap water: 24.6 K.s.i
- After 720 hrs in 100% relative humidity at 150°F: 15.5 K.s.i. sheer strength for .05" lap
Standard finishes: Mechanical, electrodeposited, chemical, organic, and plastic.