Yoke dragging is not specifically prohibited in ASME Section V. Neither is yoke flipping. Yoke oscillating is also not prohibited. Rather, I suspect that the continuous method IS prescribed. Dragging, flipping and oscillating, when properly qualified may be acceptable.
Dragging and tipping the yoke are sometimes seen where the Level III is not exercising sufficient control. Usually it comes from those who have been allowed to develop a "my way" attitude and have not considered the consequences of these departures from established technique. Sometimes it comes from a desired to speed up the testing process.
When applied in a controlled fashion, with strictly controlled parameters, I agree the use of moving poles could be a viable method.
I do not however agree with dragging or tipping in standard hand-held applications due to the lack of control over variables.
Yokes have articulated poles for a purpose, folks.
It may not be written as such but it is required that the poles have max contact with the test piece: at correct magnetising force and max contact you will never drag a yoke. Furthermore if one dragged a yoke on the test piece, damage may result. Yes, DO NOT DRAG A YOKE.
I asked this question cause I was told I didn't know what i was doing when I told a co-work that you can't do that plus it made nosense to do that anyway, cause it doesn't speed up the inspection and could lead to false indications and damage the surface, his respones was I've been doing this for 28 years. Me only 7 years. Thank you for your respones to this question, it will help me defend my education and training.
You are bringing up a topic that is very close to my heart. I've said many times to who wanted to listen that there are two kind of people. The ones who makes mistake for lack of knowledge. I guess we're all guilty of this to a dgree, since we can't know it all. With this kind of people, instruction (teaching) will solve the problem and you end up with a good technician. The second kind is the one who thinks they know it all. These ones, you can't do nothing with and contrary to what you wish for Nick, they're not smart enough to know any better.
As for your point regarding ethics Dent, in theory this is all fine, but reality is a different matter. Many companies out there don't care about what is going on. The "boss" sit in his office and want the job done. Very often the good technicians are hassle because it does take time to do a good job compare to those who like to take short cuts. And when the S... hit the fan, he can invoke ignorance of the problem and the technician is the one left holding the bag. As for "Reporting to PROPER Authority", well something may be done about it, but at the end of the day, they always find out who blew the whistle and in the end no one like a whistle blower. So that person although he wanted to ensure our profession kept a high standard is basically force to accept work in another profession.
Its kind of sad, but it likes being caught between a rock and a hard place.