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[MW:2666] colour of fillet welding

By Materials & Welding
Hi there, can anyone please tell me that in submerged arc welding, why
does sometimes the colour of welding many timesd comes blue and
sometimes it comes yellow. the steel we use is ASTM A572 Gr. 50
Type1 .Thanks,Rohit Rawat.Asst. Engineer(Quality Assurance),Kirby
Building
Systems,Haridwar.

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