What should count as dimensional acceptance after welding? (Fairino FR5)

ChloeBrown0918 · 11 Aug 2026, 05:00 UTC

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CH
ChloeBrown0918
We're planning planning repeatable welding of bracket assemblies with Fairino FR5 on a steel gusseted bracket assembly in a robotic welding project review. Our old inspection notes say it looks aligned while restrained, then falls outside the drawing requirement after release. I want to untangle fit-up, fixture location and final inspection before our new cell inherits an unexplained correction routine. This is a records review, not live welding adjustment

21 replies

IM
ImranBarnes0566
Replying to ChloeBrown0918

Compare the specified inspection condition and reference supports with the historical sheets. Do individual measurements identify whether the assembly was restrained or released?

19 points
CH
ChloeBrown0918
Replying to ImranBarnes0566

@ImranBarnes0566 My sheets contain both restrained and released results, with some conditions unlabelled. Although the drawing specifies the dimension, the inspection procedure doesn't clearly define the supports

5 points
IM
ImranBarnes0566
Replying to ChloeBrown0918

Have quality and the drawing owner define the acceptance condition. Group the old results by known measurement state; that should make them comparable.

23 points
HE
HenryBrown0873
Replying to ImranBarnes0566

Grouping by restraint state won't fully establish comparability if reference supports, fixture revisions or process revisions differ or remain unknown within each group.

21 points
IM
ImranBarnes0566
Replying to HenryBrown0873

@HenryBrown0873 That's a fair correction. State grouping addresses only one source of difference; the review also needs support conditions and fixture and process references, with missing information explicitly identified.

6 points
CH
ChloeBrown0918
Replying to ImranBarnes0566

Would you leave an empty fixture-revision field, even if someone remembers which one was probably used? That's already becoming an argument here

2 points
IM
ImranBarnes0566
Replying to ChloeBrown0918

Keep the revision unconfirmed in the data. A separate note can preserve the recollection as a lead without presenting it as an established fixture reference.

16 points
HA
HassanBennett0704
Replying to ImranBarnes0566

On my bracket job, filling blanks from memory produced a very persuasive trend. Finding the original fixture sheets made the trend disappear. Not my favourite chart

4 points
JO
JonasBaker0459
Replying to HassanBennett0704

@HassanBennett0704 If the fixture holds it straight, why isn't that already the result we want?

17 points
IM
ImranBarnes0566
Replying to JonasBaker0459

The acceptance requirement may apply to the released assembly. A dimension maintained by fixture restraint doesn't establish what that dimension will be once the restraint is removed.

13 points
CH
ChloeBrown0918
Replying to ImranBarnes0566

@ImranBarnes0566 I've had the drawing owner confirm the released inspection condition and its reference supports. Quality is adding those requirements to the sheet so the measurement state is explicit

4 points
HE
HenryBrown0873
Replying to ChloeBrown0918

That establishes the intended inspection basis, but the measurement conditions of unlabelled historical results still remain unknown.

14 points
CH
ChloeBrown0918
Replying to HenryBrown0873

I'll keep those old entries flagged. The new definition helps the review; it doesn't magically repair the old paperwork

14 points
IM
ImranBarnes0566
Replying to ChloeBrown0918

@ChloeBrown0918 Where sample links exist, pair incoming fit-up observations with the released measurements. That allows the welding engineer to assess associations in the context of the documented process.

11 points
CH
ChloeBrown0918
Replying to ImranBarnes0566

The linked records show different fit-up conditions among assemblies that moved after release. It's a lead, but I can't tell whether fit-up caused the movement

14 points
HA
HassanBennett0704
Replying to ChloeBrown0918

Give your welding engineer both the pattern and its limits. A useful association doesn't need dressing up as a diagnosis to deserve attention

18 points
JO
JonasBaker0459
Replying to HassanBennett0704

Could adding restraint prevent the movement seen after release, or is that an unreliable assumption?

12 points
IM
ImranBarnes0566
Replying to JonasBaker0459

Additional restraint may alter distortion without establishing acceptable released dimensions. The fixture and welding specialists should jointly assess how restraint, thermal movement and release interact.

17 points
CH
ChloeBrown0918
Replying to ImranBarnes0566

I'll keep that as a design-review question. Should suggestions about welding sequence go to the welding engineer in the same pack?

11 points
IM
ImranBarnes0566
Replying to ChloeBrown0918

Include them as proposals requiring the welding engineer's assessment against applicable process requirements. A fixture-review note shouldn't itself authorise a change to the welding sequence.

6 points

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