a question for those who know

Date 12-06-2002 12:27

Our shop does pretty heavy weldments at times, where one could be very useful obtaining the preheat temp. required. We have used homemade heat tubes made out of 4" std.pipe w/ lots of 1/2" holes drilled in it and use a large heating tip to get thick stuff up to temp. before welding. We've used it for heat cambering large girders too.

If you can't find what you are looking for, give the heat tube a try.
John Wright

By RonG

Date 12-06-2002 12:39

Induction heating is much like (but not) Micro Wave).

It is used extensensively in manufacturing because of its ability to heat a specified area quickly and precisely.

For the most part It consist of copper tubing connected to an high frequency controle. The heat (high freq. bands) are broadcast around the tubing. The water in the tubing serves as a conducter and carrys the heat away from the tubing.

There is also a few different styles of bearing heaters that use Induction with just Iron bars. Lower current (no coolent needed).

By scmait

Date 12-06-2002 15:44

We do regular induction heat treating on a production basis in the aerospace industry. We primarily use it to locally induction heat treating on weldment. I have had exposure to induction welding but very limited. Here is a web site that might help you: http://www.processandprevention.com/PDF/AT%20Full%20text/at06.pdf

SCMait

By jwright650 (*****)

Date 12-06-2002 16:06

SCMait,
Interesting article, thanks for sharing!
John Wright

By DGXL

Date 12-06-2002 17:06

Try http://www.cooperheat-mqs.com/

They have been around for years and provide an excellent service. I worked with these guys in the Middle East.

By RonG

Date 12-06-2002 20:10

http://www.ameritherm.com/aboutinduction.html

By pmiller Date 12-26-2005 20:29

another good site for induction heating information is http://www.inductionatmospheres.com

By swank

Date 12-07-2002 00:59

thanks folks, i appreciate the help.

By cawelder (**)

Date 12-10-2002 00:35

We have used them when welding cracks in press jugs. The jugs usually have a wall thickness of about 6-8". When we find a crack we have to cut and grind all the way to the bottom. Usually by the time were ready to weld the crack has grown to around 18" Long x 10" Wide x about 6-8" deep. We use Kelson or Cooperheat. They come in and wrap the entire jug with ceramic blankets which are connected to a control. The control keeps the jug a constant temp. while were welding on it. The control can monitor the temp and keep charts for the Engineers to examine. If it gets too cold they turn the heat up, if it gets to hot, we stop welding. After we get through welding they stress releive it by heating the whole thing up until its cherry red. The let it cool slowly. Pretty cool process.