Aftek EHS Transformers for Heat Treatment, Welding Machines and Power Consoles

Aftek EHS, a business group under Hotfoil-EHS, designs and manufactures electrical transformers used in heat treating, welding machines, power consoles, and other industrial applications. Aftek transformers regulate amperage and voltage and convert the AC source to a suitable current for welding and heating. Aftek also manufactures step-up transformers that convert 208, 3 phase to 480 volt 3 phase for machine operation in facilities without access to 480-volt power. All products are proudly manufactured in the USA.

For more information about Aftek transformers, contact Hotfoil-EHS. Call them at +1 609-588-0900 or visit their website at

Merry Christmas from Hotfoil-EHS


Merry Christmas from Hotfoil-EHS

Thermocouple Attachment Units Save Time and Money

Thermocouple Attachment Units

Always find yourself buying pre-made thermocouples? Do you have a hard time identifying the quick and easy ways to go about attaching studs or pins to a target structure? It sounds like you need a thermocouple attachment unit. The TAU will save time and money and allow you the control to fabricate these products when and where you need them.

The Hotfoil-EHS Thermocouple Attachment Unit (TAU) allows the capacitive discharge method to connect thermocouples to a workpiece directly. 

This productivity tool offers high integrity welded bonds that provides secure and precise temperature control and documentation by reducing the possibility of costly rework due to thermocouples breaking off during the heat treatment process. Thermocouple attachment units offer a very convenient and economical method of forming and attaching thermocouple sensing wires, studs, and pins where and when you need them. 

A unique automatic operation function of the Hotfoil-EHS TAU overcomes difficulties associated with manual attachment units that require both hands to work.  When operating at high levels or inaccessible areas, Hotfoil-EHS's TAU needs only one hand to use, a significant safety feature.


Pre and Post Weld Heat Treatment

Pre Post Heat Treatment

Heat treatment in any large-scale welding process (such as pipeline welding, shipbuilding, boiler manufacturing) is critical to a weld's efficiency and, therefore, essential in a structure's performance, and therefore its importance can never be overlooked. 

An examination of industrial code or a consultation with a welding specialist is imperative if in doubt. A review of the welding code is the first determinant of whether preheating is required. The welding code carefully defines the minimum preheat, the temperature, the soak time, and the welding method. Many requirements, all obtained from years of rigorously checked data, are recognized by welding codes. This data is well supported by several sources, including metallurgical research, chemical material properties, and radiographic analysis. 

Welding heat treatment in its simplest form is the process of heating the base metal (parts to being welded) before welding to the desired temperature and then allowing it to cool at a given rate under regulated conditions. The exact temperature the component needs to achieve (before welding) is called the "preheat temperature." 

There are several main reasons why preheating before welding is necessary. A preheated part cools more slowly, which slows down the welded part's overall cooling rate. This slow cooling strengthens the metallurgy (crystalline structure), which makes it less susceptible to cracking. Hydrogen that could be present immediately after a weld is therefore released more effectively, reducing cracking risk. Preheating at the weld joint and surrounding metal often mitigates stress from the shrinkage. It is preheating that decreases the risk of fractures due to brittleness during processing. 

Electric preheaters for welding, known as "ceramic mat heaters," are durable and versatile heating components built to fit evenly around the weld and surrounding area. Ceramic mat heaters are temperature controlled by a power console that uses thermocouples and electronic controllers to regulate the preheat temperature profile, track it, and record the temperature data. 

Another less favored method for heating the target piece is with a torch or open flame, but this method has apparent safety issues and controllability problems. Also used are heat treat furnaces, but these usually involve off-site transport of the target item. 

For safety, portability, and controllability, induction heaters give an appealing alternative. Induction heating is endorsed because, instead of open flames or external electrical components, it uses molecular excitation as its source of heat. Induction heating operates very rapidly, and there are far fewer worries about component contamination since there is no interaction with the target item. When very high temperatures and uniform control is required, many industrial processes use induction heating.

It is critically important to review and discuss your heat treating requirements with an expert before welding. Don't risk safety or waste time and money by "winging it" when it comes to heat treatment.


Happy Labor Day from Hotfoil-EHS

Happy Labor Day

 A sincere thanks to all the hard working people who make the US economy run each and every day.