ALBA Industrial
CONTACT US:  +4793888557
EMAIL:               info@alba.no

Producing Titanium Castings

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.

Globe valve body
16" Globe valve body

Machined graphite or investment technology

We offer castings produced by either machined graphite or investment technology. 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 technology are generally 10 % lighter in weight compared to traditional sand mould technology using wooden patterns. 

 

 

Graphite mould or investment casting
Graphite mould or investment casting

Lost foam technology

Middle and small size castings of complex shape are produced using lost foam technology. The patterns are produced by ALBA pattern shop.

Lost foam technology
ALBA uses lost foam technology

Making the mould

The 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.

Machined Graphite Mould
ALBA uses a machined graphite technology

Melting and pouring

Titanium 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 grams up to 1500 kg.

Melting and pouring
500kg melting furnace

Inspection and Quality control

Castings 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)

ALBA inspection
ALBA inspection

Weld repair

Our 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.

Weld repair performed in certified room
Weld repair performed in certified room

Finishing operations

Castings are as standard delivered in pickled and cleaned condition.


We offer finish machined castings.

Machining of castings
Machining of castings