Showing posts with label heat treating. Show all posts
Showing posts with label heat treating. Show all posts

Replacing the Print Head on AH4000 Recorder

AH400 Recorder
AH400 Recorder
The AH4000 multi-channel recorder is used on HotfoilEHS power consoles to monitor and record pre weld, soak, and post weld heat treating. One of the most common questions asked is how to replace the print head.

The video below provides visual, step-by-step instructions.




10 Million BTU Burner for Custom Designed Heat Treating Furnace

Custom heat treating furnaces are designed for the tempering of metals. These furnaces can be electrically heated, or gas heated, depending on the energy source available. Tempering is defined as (from Wikipedia):

"Tempering is a heat treatment technique applied to ferrous alloys, such as steel or cast iron, to achieve greater toughness by decreasing the hardness of the alloy. The reduction in hardness is usually accompanied by an increase in ductility, thereby decreasing the brittleness of the metal. Tempering is usually performed after quenching, which is rapid cooling of the metal to put it in its hardest state. Tempering is accomplished by controlled heating of the quenched work-piece to a temperature below its "lower critical temperature". "

The video below shows the testing of a 10 million BTU ratio air burner designed for a custom heat treating furnace used to pre-stress large metal components prior to welding. Hotfoil-EHS manufactures complete furnace systems using OEM burners and in-house developed control systems.



For more information, contact:

Hotfoil-EHS
2960 East State Street Ext.
Hamilton, NJ 08619
Phone # 609.588.0900
Fax # 609.588.8333
Email: dap@hotfoilehs.com

An Introduction to Thermocouples

Schematic of Type K Thermocouple
(courtesy of Wikipedia)
A thermocouple is a temperature sensor that produces a micro-voltage from a phenomena called the Seebeck Effect. In simple terms, when the junction of two different (dissimilar) metals varies in temperature from a second junction (called the reference junction), a voltage is produced. When the reference junction temperature is known and maintained, the voltage produced by the sensing junction can be measured and directly applied to the change in the sensing junctions' temperature.

Thermocouples are widely used for industrial and commercial temperate control because they are inexpensive, fairly accurate, have a fairly linear temperature-to-signal output curve, come in many “types” (different metal alloys) for many different temperature ranges, and are easily interchangeable. They require no external power to work and can be used in continuous temperature measurement applications from -185 Deg. Celsius (Type T) up to 1700 Deg. Celsius (Type B).

thermocouple attachment unit
Thermocouple attachment unit
For pre-weld heat treatment, Type K thermocouples are generally used. Thermocouples can be directly attached to the workpiece by spot welding the junction of Type K thermocouple wire. The attachment is done with the help of a TAU, or thermocouple attachment devices. Thermocouples are attached so that there is firm contact between the sensing tip and the assembly being heat treated.