induction heat brazing

tube+flange welding

Category:

Science & Technology

Tags:

• induction
• weld

[bigbollocks69]

looks like a turbo oil return pipe

[evhgl87]

you are somewhat correct, but your explanation is still incorrect. eddie currents do form but the resistance internally of the materials and the presence of eddie currents causes heat from alternating current (AC), and not DC current. its this internal resistance that heats the metal, not the transfer of the eddie currents in itself. however without the eddie currents present induction wont work. also, there is a large electromagnetic field present during induction which is how the inductor -

[dougspair]

..Is that silver based brazing paste..the flux appears to be the water based type..? The finished job looks about like 45-56% silver I use for stuff.. Nice video...

[evhgl87]

works itself. also, the freqency is not a standard. if you pull 400 amps at a certain frequency that frequency is chosen for the material you are wanting to control/melt/weld. so it does take some knowledge. i know you mentioned your description as simple but you were also somewhat misleading in leaving out the major important details =]

[bozzza69]

wouldnt you jsut stick or mig or tig that part insted of heating and potentialy deforming the whole thing

[TehMG]

As for the very large tubing used for the coil, this is for several reasons. Due to skin effect, the current at high frequencies flows in the outside of a wire, not on the inside, thus having a solid piece of wire is useless. Also, we can flow water through the tubing to ensure the coil does not overheat and stays cool.

Now that was a pretty basic explanation. If you want to know more, search the terms "eddy current" and "skin effect".

[TehMG]

doesn't heat up and waste energy. The higher the frequency the greater the possibility of eddy currents. This is why transformers that operate at high frequencies such as in switch mode power supplies are made of a powdered ferrite core (tiny ferrous particles cemented together). Eddy currents in a transformer are undesirable.

In an induction heater however these eddy currents are desirable, and it is the principle that makes induction heating possible.

[TehMG]

The high frequency current through the coil induces current flow into the metal to be heated. At these high frequencies, eddy currents form in the metal, which act like hundreds of tiny short circuits, creating heat in the metal.

If you've ever taken a look at a power transformer, you've probably noticed it is made is several iron laminations with some sort of varnish in between, rather than a solid chunk of iron. This is done to reduce eddy currents in the transformer core, so that it

[harryfodder]

i'm trying to understand myself, but i think its the same concept as an electric motor. you have current running through those big fat wires, and it creates a flow of electrons (and a field that extends beyond the wire) the field is what creates the heat. i could be slightly off with my comprehension of this interesting technology though, but nevertheless i'm VERY interested in it!!

[newcomer9747]

What's the grain flow like?