Technical data sheets
Aluminium Alloy | Commercial Alloy
Transition Joint
Triplate is widely used for the on–site welding of aluminium to steel, for example ships hulls to decks and oil rig superstructures to steel supports.
It consists of a steel base material and a corrosion resistant marine-grade aluminium alloy top layer with an intermediate layer of pure Aluminium to promote bonding.
The three Triplate layers are homogeneously bonded together by vacuum-explosion welding.
Using Triplate
During processing the temperature of the material MUST NOT be allowed to exceed 315 Centigrade.
DO NOT pre-heat the transition joint before welding.
Welding methods to be used are similar to those for the parent metals.
Ideally the aluminium weld should be made first after removal of the aluminium oxide film by wire-brushing, followed by de-greasing. Argon shielding gas is recommended. Small diameter wires are recommended (1.2mm). Welding methods include GTAW, GMAW, TIG, MIG and Synergic pulse MIG.
The steel weld is made using a coated electrode and GMAW, SMAW or FCAW. Small diameter electrodes are recommended (2.5mm).
When bending ensure that the minimum bend radius is at least ten times the strip width or thickness.
Mechanical Properties
Shear Strength – Basemetal/Intelayer: > 55N/mm2
Tensile Strength (through thickness): > 75N/mm2
Chemical Composition
Base Material: Steel LRS Ship-Plate Grade A or St 52-/3N
Interlayer: 99.5% Pure Aluminium – Alloy 1050A
Superlayer: Aluminium Alloy 5083 (AlMg4.5Mn)
Size
Width: 25mm
Thickness: 34/35mm
Lengths: 3800mm
Specification / Approvals
Triplate meets MIL-J-24445A and is approved by Lloyd’s Register of Shipping.
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Last updated Thursday, November 7, 2013
Disclaimer
This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon.
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The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed & online) and manufacturers’ data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources.
Material supplied by the Company may vary significantly from this data, but will conform to all relevant and applicable standards.
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