Optimum root opening

[DaveMacK]

What is the optimum root opening, for complete penetration weld, in a single pass, one side only for the material and joint described below?
Weld process is GTAW, 3/32 tungsten, 2% thor.


Titanium 6Al 4V, 0.100” thick
Single V butt joint, 60 Deg included angle with 0.025 root face.

Also, please direct me to any formulas that apply for determining root opening.

Thank you,
Dave

 

[Goahead]

The Metals Handbook Eighth Edition vol. 6 gives in Table 1 at page 376 that for Titanium base metal thickness of
0.031 to 0.125", root opening should be between 0-0.10t (t=thickness) with square groove butt joint (no bevel).

http://www.welding-advisers.com/

 

[metengr]

This information is captured in Table 22 of page 29 of the Titanium - design and fabrication handbook from the web site below;

http://www.timet.com/Index2_content.html

 

[DaveMacK]

Thank you for the replies.

I am using the 0.0-0.1t for the root opening.
Welding 0.100” thick 6-4 Ti ,I am having difficulty achieving complete penetration the length of the plate.
I am running at 200 to 230 amps: Utilizing an inert atmosphere glove-box

My usual Ti welding is from 0.005” to 0.070”, welds within this range are just fine.
The 0.100” thick Ti is presenting a bit of a problem.

Any suggestions?

 

[metengr]

Have you looked at increasing the diameter of the weld wire for the slightly thicker base metal or adjusting your electrode travel speed and or wire feed rate ?