Search results for query: *

The inspection technique is validated by use of a hall Effect Probe - there is 40-50 gauss at the current setting. For a material to be ferro-magnetic it must retain magnetism otherwise it wouldn't be ferro-magnetic. The part is tube shaped and is 3" long and approximately 3/4" in diameter.

The reason for the etch is to remove smeared metal prior to Fluorescent penetrant inspection. It is a specification requirement.

I would like to find a good etching solution to use in a production setting for 300 series stainless steel parts. We need to remove between 0.0002-0.0007" of material. Common grades are 304, 316....

We are trying to perform magnetic particle inspection of A108 material. After we send current through the parts, we are finding that there is no residual magnetism. The material does have some chrome and nickel (0.13 and 0.06) and copper (0.16) but shouldn't influence the magnetic properties...

We have recently been informed that we over etched some titanium parts. The material is 6AL-4V. The parts that were over-etched were machined from forged material. Our etch rate determination was performed using titanium sheet material. The etch rate on the forging was 3x more aggressive...

Where can I find magnetic permeability values for 4130, 4140, 15-5 and 17-4 steels?

1. What causes a part to become demagnetized when it is ran through an AC coil? Are electrons removed from the outer electron shell leaving un paired electrons? 2. What causes a part to become demagnetized when it is heat treated? Again, does the heat treat process remove electrons from the...

What is the distinguishing characteristic that makes a material magnetic? My understanding is there must be unpaired electrons in the outer electron shell and/or the atom radius and distance from the atom center to the outer electron shell must be greater than 3:1. Please expand/confirm.

I have found a condition that I hope can be logically explained. We inspect 17-4 material using magnetic particle. Periodically we find a condition known as alloy segregation or banding in the material. It generally is in the center 1/3 of the material running the entire length. Banding is...

I have a company that performs magnetic particle inspection of finished machined parts that are in the hardened condition. Periodically, we identify a condition known as "banding". The principal materials are 17-4 and 17-7. We have conducted metallography and identified after etching, a...