Welding Titanium in Dust Free Enclosure

[bmoorthy]

I am looking for the acceptable dust level in Dust free Enclosure. Are there international standards/Norms giving guidelines for welding Ti in Dust free Enclosures.
What kind of instruments are generally used for checking dust levels.

 

[GRoberts]

I haven't seen requirements for dust in a Ti welding chamber before. The main concern is usually Oxygen. As far as monitoring dust, the industry that builds/uses clean rooms for the computer industry has a system. You might check with someone from that field.

 

[mahend]

There is a test to find out the ferrous content in the air dust which is also a factor for dust free atmosphere.
It is named as "Phenanthraline test".

there is no other standards for clean room.

 

[sayee1]

someting related to yr query
Contamination cracking
If iron particles are present on the component surface, they dissolve in the weld metal reducing corrosion resistance and, at a sufficiently high iron content, causing embrittlement. Iron particles are equally detrimental in the HAZ where local melting of the particles form pockets of titanium - iron eutectic. Microcracking may occur but it is more likely that the iron-rich pockets will become preferential sites for corrosion.

Particular attention should be paid to separating titanium from steel fabrications, preferably by designating a specially reserved clean area. Welders should guard against embedding steel particles into the surface of the material by:

Avoiding steel fabrication operations near titanium components.
Covering components to avoid airborne dust particles settling on the surface
Not using tools, including wire brushes, previously used for steel
Scratch brushing the joint area immediately before welding
Not handling the cleaned component with dirty gloves.
To avoid corrosion cracking, and minimise the risk of embrittlement through iron contamination, it is best practice to fabrication titanium in a specially reserved clean area.



Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
End of all knowledge is the attainment of immortality!