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Agpowder, FYI you would need a furnace, and hardenin is performed at arond 1500°F not 400 or 500°F Denial ain't just a river in Egypt...Mark Twain

Make sure there is no silicon anywhere in your process especially in the machining coolant. Silicon will cause soft spots and does not burn off in the furnace, quite the opposite in fact. If your parts are semi fininshed, a light zirconite blast will usually do the job of removing the...

Also came upon this company as well. They are in Midland Ontario. http://www.labx.com/ John Denial ain't just a river in Egypt...Mark Twain

Herc, Check out the website http://www.themonty.com. Gord Montgomery comes across all kinds of used equipment, and he may be able to find some of what you are looking for. John Denial ain't just a river in Egypt...Mark Twain

One thing that many people do not respect and may even be the cause for the differences in readings is the proximity of the hardness indentation to a neighbouring one. A good rule to remember is never take a hardness check closer than 3 times the diameter of an indentation. If you are too close...

One suggestion if I may, blasting with alumina grit is not going to help, on the contrary, blasting with a non-mettalic oxide can inhibit brazing even more. In fact alumina (aluminum oxide) is a common braze repellant/stop-off. Try using metallic blast like Nicroblast, or even silicon carbide is...

These is an old German firm Baumaterialien-Handelsgesellschaft AG (BHG) that makes hardware. John Denial ain't just a river in Egypt...Mark Twain

A quick and dirty way of quenching in a barrel or tub and get the quenchant warm without the need of a heat exchanger is to take a warm scrap metal part and heat it to 500°F and dump it into your cold agitating quenchant to raise its temperature. When the temperature is about right, quech your...

Might it be a case of "burning" during sample preparation,...i.e overly aggressive cutting? John

We (major aerospace engine manufacturer) often weld previously hardened material when necessary. It is critical to include a tempering (stress relieve) heat treatment afterwards. That being said, even though it is normal practise to weld hardened parts as described above, we do not weld on the...

Hi, Aluminum T0 is annealed, T4 is solution treated and naturally aged (at room temperature), and T6 is solution treated and precipitation heat treated in an oven, this is also called artificial aging. Now to bring a T0 back to T6, you have to solution treat at 970°F +/- 10°F, hold for 35...

One thing though,..be sure not to finish machine your part before you do the second heat treatment,...you will have some distortion, and not knowing your tolerances it is something to keep in mind. John

If desired, you can minimize oxidation/decarb on re-hardening by performing a copper plate all over to protect the parts. Something around 0.0005" thick should suffice. John

Having had a lot of experience in welding,NDT and heat treatment,here is my two cents on the matter. Generally speaking,performing an x-ray before and after PWHT is a huge waste of time. The sensitivity of x-rays are such that you will not necessarily see any cracks if they are too fine or even...

Hi, Just to add, it is important that the shims be clean. Degrease them well and keep them wrapped in clean paper tissue and handle them onlt with clean white gloves to prevent contamination.

Hi, Here are some of the results of my tests: 1- Wrought sheet 347 does not discolor, only machined parts 2- It does not happen 100% of the time, took an old part which was not cleaned at all, and it came out clean, except an area where I had used a grinder to identify the test part,..the mark...

Ed, I agree,..will be running a few more tests cleaning the parts in a various number of ways to determine if once and for all if it is a residue issue or not. Will re-post with findings. John

Hi, Just to answer some of the questions and give some more info. The actual parts are acid cleaned prior to brazing,.. the test pieces I used were cleaned with scotch brite and wiped clean with alcohol (reagent grade). Yes only the 347SS turns blue, the 410SS and IN718 are bright. I have...

Greetings, I have an odd problem, and I hope someone can steer me to a solution. I am vacuum brazing some 347SS machined parts with AMS4787 (gold-nickel) alloy in a vacuum furnace at 1825°F with a partial pressure of argon at 1torr. The 347SS detasil sometimes come out quite blue,with the brazes...

Thanks for all the good advice,..greatly appreciated! Maui, they are looking for runouts better than 0.010". I think that this is a bit much to ask for in a shaft thats 53" long. thanks again John