ALBA Industrial
Contact us:  +4793888557
Email:            info@alba.no

Producing Titanium Castings

Nor coupling for firehoseNor coupling for firehose

The titanium casting process requires that special techniques be used. This is due to its reactivity in the molten stage, high melting temperature and low mould filling properties.

 

Machined graphite or investment moulding system

Sand chill investment castingSand, chill or investment casting

We offer castings produced by either machined graphite or investment moulding systems. The choice of casting route depends on the requirements to quantity, surface finish, configuration and dimensional accuracy of components.

 

Investment casting technology is generally used for large quantities with close dimensional tolerances and complex shapes, and involves higher tooling- and fabrication- costs.

 

Castings manufactured using machined graphite mould or investment mould systems are generally 10 % lighter in weight compared to traditional sand mould systems using wooden patterns. 

 

 

Wooden Patterns used for very large castings

Pattern boardSet of wooden patterns for a 14" Body For larger castings with weight exceeding 380 kg (titanium) we utilise traditional wooden pattern systems.

Making the mould

Machined Mould GraphiteALBA uses a machined graphite mould systemThe mould must be relatively inert when in contact with the molten titanium metal. The type of mould material and binder used has a significant impact on the surface quality and the alpha case thickness of the casting. The thicker alpha case, the higher risk for serious failure.

 

The graphite moulds used by ALBA gives a typical alpha case thickness of 50 - 70 micron.

Melting and pouring

Melting and pouring500kg melting furnaceTitanium castings are produced in vacuum consumable-arc electrode furnaces with semi-automatic melting and pouring operations. The crucibles are either graphite or copper water-cooled crucibles.

The melting capacity ranges from 80 kg to 3500 kg liquid titanium, enabling us to produce castings with commercial weights from a few gram up to 2000 kg.

Inspection and Quality control

Dye US testingUS control of blades for agitatorCastings are manufactured in accordance with ASTM B367 under the inspection of ALBA's qualified inspectors.

 

Our NDT operators are all certified in accordance with PED / ISO 9712 (former EN473)

Weld repair

Weld repair performed in certified roomWeld repair performed in certified roomOur certified welders can repair any surface or sub-surface defects. The welding method used is GTAW with pure argon as protective gas. Welding procedures are qualified to ASME IX.

Finishing operations

Picture 16Machining of castings

Castings are as standard delivered in pickled and cleaned condition.


We offer finish machined castings.