How to remove welding scale without using de-rusting or sand blasting process

A. With a hammer and chisel, or a wire brush would be the simplest and most basic way unless I am misunderstanding. Sorry, but I think your question is a bit too vague, Manish.

Ted's answer sounds to me like a perfectly reasonable answer (perhaps the ONLY reasonable answer) to a simple straightforward question. What's your problem, Manish?

Mr Mooney is correct, your question is far too vague for anyone to give you a sensible answer. What material are you descaling? What is your current process? Why is it now not acceptable? What is the final use of the part?

Without this sort of information any of the experts that contribute to this site could write a book on descaling methods, both chemical and physical.

Sorry to have to contradict you Manish, but much more information is needed.

Well, I think it is too vague! You fail to mention if it is gas, arc, tig, mig, laser or electron beam welding. You also fail to mention if it is on hot or cold rolled steel, chromolly, cheap stainless, high nickel stainless or titanium.

Finally, you do not mention if it is a tiny or a massive part.

In answer to your question, the only methods that I am aware of are chemical and mechanical. You appear to rule out chemical, so that leaves mechanical. You ruled out sand blast, so that only leaves shot blast and manual. You did not like Ted's manual, so that leaves shot.

The quality of a response is directly proportional to the quality of the question.

A. Hi there,

Maybe you should look for an answer in the kind of welding process you are using. MIG is an option, it can diminish scale. Look better in preventing the problem.

Saludos.

A. Being new to this site, I couldn't help but feel that you guys are a little unfair to Manish. Manish asked about removing "scale", a byproduct of metal/steel being heated and cooled causing an oxidized byproduct called scale. The couple of responses regarding using Mig or Tig to reduce the "scale" makes me think that you are confusing scale with slag - a byproduct of most welding processes-which use a flux coating on the welding wire, namely, "stick welding".
Having said this, if you remove the chemical or sand blasting processes, all you have left is mechanical, i.e. power brushing followed by an alcohol based cleaner (fast drying) to wipe away the minute particles. Then you paint either clear coat or color to protect the base metal. Never introduce water to clean as this will cause the rusting process rather quickly thereby defeating the whole purpose. Did I misunderstand the question?

Thanks, Boyd! You're probably right that my response confused slag with scale, as well as that I should have asked for more detail more diplomatically.

I appreciate that Manish's most recent posting includes some good detail, and I apologize that I hurt his feelings. But the people asking questions outnumber those who answer them by a hundred to one, and if this forum is to be useful, or even survive, I can't bite my lip and post questions that I know from experience will remain unanswered; rather, I must prod for clarifications; for me to "keep mum" when questions draw no response isn't really an option. Thanks again, and please continue to participate.

WELDING SCALE REMOVAL:
- Mechanical: already answered (hammer, chisel, wire brush)
- Chemical: to immerse the object into an ultrasonic bath (inconvenient: rusty).
.
ALTERNATIVE SOLUTION:
- Modify your manufacturing process. Ex: use induction brazing instead of welding.
.
(Mr. Ted, thank you to teach me the humility).
Regards.