Posted by Jim on 11/27/2006, 8:44 am, in reply to "Re: MAGNETIC MILD STEEL"
138.162.5.11
SanJay, Rick provided a great technique for your Magnetic Arc Blow problems. 'Arc Blow' can result from grinding/machining end preps, making bevels, or removal of weld remnents and could be the residual mag fields from associated electrical/mechanical components. All brands of 7018 can be used with AC (DC+ is normally preferred for 5/32 and smaller size) however, same brands make their smaller 7018 sized electrodes with additional ingredients for AC current use and will mark those electrodes as such. If allowed, the E6011 electrode with AC current may help (lower cost). You should also try re-positioning your work lead making the return path close-by the joint area and on the opposite side from where you tried first; reduce the welding current, try welding from left-to-right or right-to-left (change travel direction) from first attempt and use a very short arc length. Ask around and you will find the AC Yoke demag technique often employed by NDT (NDI, NDE) inspectors and even a demag tech used by electric motor shops and machine shops. Maybe they would assist you and work out a trade of Skills.
Make sure your welding procedure/Project Specs allows the use of AC welding currents or electrode type. Great that you asked this question SanJay and recognized a problem.
Message Thread:
« Back to thread