Cambridge Joining Technology Ltd. CJT Home > Welding & Joining

WELDING & JOINING

CJT has developed and patented novel techniques for bonding advanced materials used in the automotive, power generation & micro-electronic industries.

High Precision Joining of Aluminium Alloys

Flux-free brazing of aluminium alloys in air, using liquid gallium, is a unique method capable of producing high precision butt-joints. One of the current applications is in the manufacture of high frequency microwave filter and diplexers. In contrast to conventional brazing techniques, formation of fillets at joint corners/irises is prevented using this approach. Read more: University of Cambridge: Insight - the Newsletter of the Corporate Liaison Office

Diffusion Bonding Similar and Dissimilar Superalloys using the Patented Shirzadi Bonding Method (SBM)

Creep test sample which failed within the parent Inconel 600, away from the bond line.	Various bonded nickel and cobalt-base superalloys subjected to severe mechanical deformation without showing any preferential failure of the bondline.
Optical micrographs show bond lines in cobalt (left) & nickel (right) base superalloys are virtually invisible.

High precision joining of stainless steel

Joining stainless steel rings to thin-walled stainless steel tubes used in manufacturing surgical devises

Joining Stainless Steel to Aluminum

Stainless steel 316 - aluminium (Al-6082) bonds after being subjected to bending and torsion loads.

Joining Titanium to Aluminum

Titanium (Ti-6Al-4V) - aluminium (Al-6082) bonds exhibit excellent bend strength (left) and have shear strengths as high as that of the parent aluminium alloy (right).

High Strength Aluminium Bonds

Right: Solid-state diffusion bonds in aluminium alloys have tensile strengths as high as the parent alloy. Left: High strength diffusion bonds in aluminium alloys subjected to severe mechanical deformation. No failure of the bond interface occurs and the bonded samples behave like a monolithic piece of aluminium. 1. Three point bending tested sample (bondline is vertical) 2. 180° twisted sample (bondline is horizontal)

Brazing Stainless Steel Metal Foam to Conventional Stainless Steel (316L)

Stainless steel metal foam bonded to conventional stainless steel and subjected to various mechanical tests:

(a) three point bending
(b) canter-lever bending and
(c) tensile

In all samples the failure occurred away from the joint interface.

High Precision Joining of Stainless Steel

Cross-section of a thin-walled 32 mm diameter stainless steel tube diffusion bonded to a thick stainless steel plate.

Note that the bonding process was carried out at a temperature below the melting point of the alloy resulting in a very high precision joint with no microstructural changes at the bond interface.

Joining Hastelloys

Diffusion bonded Hastelloys subjected to severe bending force.

Joining Metals to Ceramics

Left: A new approach has been used to overcome the problem with joining materials which have different coefficients of expansion (e.g. ceramics and metals). Using this new method, metal-ceramic bonds capable of enduring thermally induced stresses were produced. The picture shows that the bonded sample withstood a large amount of plastic deformation before failure. http://www.msm.cam.ac.uk/phase-trans/2008/foam.html Right: Sapphire sandwiched between aluminium alloy for academic research purposes, University of Cambridge.

Links to external sites related to Welding and Joining

---

For further information please contact:
Email: enquiry@cjt-limited.com
CJT Ltd., 12 Spens Avenue , Cambridge, CB3 9LS, U.K.
Tel: +44 (0) 798 083 9374, Fax: +1 270 638 3580

© 2005 CJT Ltd, U.K.