TRIPLATE TRANSITION JOINT

A transition joint that is homogeneously bonded together by vacuum-explosion welding and is often used in shipbuilding for welding an aluminium superstructure to a steel hull.

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Size & Range

-                                        Dimension
+                                        Value
-                                        Standard strip width
+                                        Variable
-                                        Standard strip length
+                                        max 3800mm
-                                        Standard strip thickness - steel
+or 18mm
-                                        Standard strip thickness - aluminium
+or 16mm
-                                        Standard strip thickness - total
+or 34mm

Range

-                                        Size (mm)
+                                        Comments
-x 16 x 34
+                                        Triplate meets MIL-J-24445A and is approved by Lloyd’s Register of Shipping.
-x 20 x 34
+.1 certification supplied unless requested otherwise.
-x 25 x 34
+.2 Lloyds available upon request at time of production.
-x 30 x 27

Whilst similar products are manufactured by explosive welding in atmospheric conditions, the unique shockwave process produces superior results as shown below.

Atmospheric vs Vacuum Cladding

-                                        Atmospheric
+                                        Vaccum
-                                        Coarse oxide agglomerations with porosity at the steel aluminium interface.
+% dense, homogenous joint.
-                                        Oxide agglomerations & porosity initiate fracture.
+                                        Does not apply.
-                                        Oxide agglomerations & porosity can cause corrosion, in spite of protective coatings.
+                                        Does not apply.
-                                        Bending of aluminium-steel strips can be difficult due to the coarser bond structure.
+                                        Very good formability due to ductile aluminium-steel joint.
-                                        Production control is limited by variable weather conditions.
+                                        Optimal process control due to constantly reproducible vacuum conditions.
-                                        Aluminium-steel joint is hard, making sawing & forming difficult.
+                                        Easy sawing & forming due to ductile aluminium-steel joint.

Industry Applications

Mechanical Properties

-                                        Property
+                                        Value
-                                        Shear strength – Basemetal/Intelayer
+                                        >55N/mm2
-                                        Tensile strength (through thickness)
+N/mm2
-                                        Processing temperature
+                                        max 315oC
-                                        Bend test base material in compression
+                                        Acceptable
-                                        Bend test base material in tension
+                                        Acceptable
-                                        Side Bend Test
+                                        Acceptable

Chemical Composition

-                                        Layer
+                                        Material
-                                        Base material
+                                        Steel LRS Ship-Plate Grade A or St 52-/3N
-                                        Interlayer
+.5% pure aluminium - Alloy 1050A
-                                        Superlayer
+                                        Aluminium alloy 5083 (AlMg4.5Mn)

Industry Applications

During processing the temperature of the material MUST NOT be allowed to exceed 315°C.
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.