How to clean the inside of the small pipe after welding

[minh-thanh]

Hi All !
As the title says, after welding the oil pipe for my engine and I want to clean the inside - the pipe has 2mm and 4mm inside diameter
Any comments or solutions?
Thanks

 

[Longboy]

No mechanical means. Soak and swish around the tube in soapy water. Internally dry with compressed air.

 

[SmithDoor]

Manufacturers use a clay with grit and pump though the tubes.

You can use a sand blaster with a extension tip. Take a long time but cleans the weld.
If have large spot you need the welder to clean spot with drill.

I have also used break hones too.

Dave

 

[SmithDoor]

FYI if is curve tube use a rubber hose on the sand balster tip.

Dave

 

[michael.kilpatrick]

A bit late now, but that would have been better joined using silver solder. the flux is disolved in warm water after a couple of hours.
Regards
Mike

 

[SmithDoor]

If it was for food production they use Camaras for inspection. If weld was not clean inside scap and go again. The FDA has rules for this work. I was in structural steel witch has different set of rules to follow and did not do FDA type work.
When I did tubes in photos for engines most time used brazing .

Dave