Part movement when welding Titanium?

==================== Need more information. Will the parts be jig welded or "freehand?" Thick to thin sections? Amount of weld, i. e. tack or full extended bead? What are the tolerances and end uses? Post weld stress relief?

Parts will be pinned together. About 1" of bead 2" apart, 2 places on each side of 4" long X 1.4" wide part. Same thickness, give or take .06, at 1/4" thick. No post stress relief unless needed.

Thanks for your time!

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Much will depend on the ti alloy and welding conditions, e. g. stable/warm room temperature with no drafts, parts stored overnight to equalize temperature, low heat conductivity welding support [not steel table], and skill of welder, i. e. gas flow, rod size and amps.

As these are ti parts, with an end-use which cannot be disclosed, you may well be using GDT true position tolerances

IMNSHO +/- 0.005 over 4 inches, particularly if this involves flatness/squareness, may be problematic. One thing that could be helpful is to minimize uneven cooling by burying the parts in lime or mica immediately after welding.

I would certainly first try welding to see how it goes.

One thing that could help if there is a problem is to fabricate a jig or fixture to hold the parts in the correct alignment avoiding any stress on the [area around the] pins, and keep the parts in the jig/fixture until these are cool. [Fixture should be warm/hot to avoid chilling weld] This is most practical for prototype or very low production.

One thing to check is adhesive bonding rather than welding.

Is this to be an xray, ultrasound or zyglo checked weld, and will the welder have to be certified?