ASTM A380 - Stainless Steel - Pickling & Passivation - Pipe weld inside

[thandion]

Dear experts,

My question is, after welding our clint wants us to do pickling and passivation on the welded A312 TP316L stainless steel. But they want to do pickling on the inside of pipe as well (weld area). The thing is we are purging weld from inside until weld is finished and cooled down, so there wouldnt be any heat changes at the inside. And natural chrom-oxide layer could happen easily.

Is this really mandatory? Your urgent response is appreciated.

PS. weld is only from outside, oneside bevel.

Thanks a lot.

 

[EdStainless]

This is being answered in another thread.

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