American Made Heat Treatment Equipment: Everything You Need from One Reliable and Knowledgeable Source

Hotfoil-EHS manufactures pre and post-weld heat treating equipment including: power consoles; ceramic mat heaters; thermocouple attachment units (TAUs); pin welders; Brinell testers; Poldi hardness testers; thermocouple wire; insulation; and accessories.

EHS engineers, designs, and manufactures proven systems to effectively complete any project more efficiently than competitive systems, while staying competitive within any budget. Years of application experience and successful installation history have produced thousands of happy customers.  Quality and durability at an affordable price, and a focus on customer service second to none.


Electric Heating 101: Ohms Law



The most basic circuit involves a single resistor and a source of electric potential or voltage. Electrons flow through the circuit producing a current of electricity. The resistance, voltage, and current are related to one another by Ohm's law, as shown in the figure. If we denote the resistance by R, the current by i, and the voltage by V, then Ohm's law states that:

V = i R

Resistance is a circuit property that offers opposition to the flow of electrons through a wire. It is analogous to friction in a mechanical system. The resistance is measured in ohms and depends on the geometry of the resistor and the material used in the resistor.

Other manipulations of Ohms Law:



Pre Weld and Post Weld Heat Treatment

Pre Weld and Post Weld Heat Treatment
Welding between insulated heating areas
Heating done by ceramic heaters (pink). 
There are several key reasons why it's important to preheat before welding. First, a preheated part cools more slowly, which slows the overall cooling rate of the welded part. This improves the metallurgical (crystalline) structure and makes it less prone to cracking. Additionally, hydrogen that may be present immediately after a weld is also released more efficiently, which further reduces the possibility cracking. Preheating also mitigates stress from the shrinkage at the weld joint and nearby metal. Finally, pre-heating reduces the possibility of fracture during fabrication due to brittleness.

An industry standard means of accurately managing the pre-heat and post-weld heat treatment is through the use of specialized electric heaters. Electric welding preheaters, known as "ceramic mat heaters", are rugged and flexible heating elements designed so that they conform uniformly around the weld and surrounding area.  Ceramic mat heaters are normally controlled by a power console that uses thermocouples and electronic controllers to regulate, monitor, and many times record, the preheat temperature profile.

ceramic mat heaters on spool piece
Ceramic heaters on spool piece.
Welding codes, gathered from years of rigorously tested data, including metallurgical science, chemical properties of materials, and radiographic analysis, provide specific detail on the minimum preheat temperature, the soak time, and the welding process to be used.

Before deciding to preheat or post heat any welding job, consult with a heat treating expert to make sure proper welding code requirements are being followed.

Happy New Year from Hotfoil-EHS

With 2017 coming to a close, all of us at Hotfoil-EHS wanted to reach out and send our best wishes to our customers, our vendors, and our friends! We hope that 2018 holds success and good fortune for all of you.


Custom Fabrication and Manufacturing Services from Hotfoil-EHS

Security door
Custom security door.
Hotfoil-EHS has 68,000-square-feet of manufacturing space available for custom manufacturing. Capabilities include laser cutters, CNC machines, sheet metal breaks, Bridgeport milling machines, rollers and welding machines.

Hotfoil-EHS now provides full service custom metal fabrication including machining, metal forming, and welding, as well as a variety of other metal fabrication processes.

With years of expertise in forming, notching, punching, as well as MIG, TIG, and arc welding, Hotfoil-EHS’s experienced staff will work with you to make sure that your specifications are met.

From rapid design and prototyping to extended productions runs, Hofoil-EHS can provide all your metal forming and fabrication needs.
Examples of Hotfoil-EHS's custom manufacturing services are:
If you're interested in custom metalworking, or design and fabrication of any metal structural component, contact Hotfoil-EHS by calling 609.588.0900 of visiting https://www.hotfoiehs.com.

AFTEK-EHS Shows Quad Arc Welder at International Workboat Show 2017

AFTEK-EHS booth at Workboat Show with Quad Arc Welder
AFTEK-EHS booth at Workboat Show with Quad Arc Welder.
AFTEK-EHS (a division of Hotfoil-EHS) just finished a very successful exhibit at the International Workboat Show (the show ran from Nov. 29 - Dec. 1). The International Workboat Show is a trade-only conference and expo for commercial vessel owners, operators and builders as well as the vendors and suppliers that serve them. AFTEK-EHS featured of their most unique and popular products, the Quad Arc Welder. 

The Quad Arc Welder is designed for heavy arc welding and engineered for low maintenance in harsh environments. It is simple to operate and reduces space by combining 4 welders in one package. It is protected with thermostatically controlled alarms on both its rectifiers & transformers.  Dimensions are 51" wide x 40" deep x 57" tall. The Quad Arc is a perfect choice for many of the attending vessel builders, owners, and operators.

For more information, contact Hotfoil-EHS by calling 609.588.0900 or by visiting https://www.hotfoiehs.com.

Custom Generator Trucks for Mobile Heat Treating

Hotfoil-EHS designs and manufactures custom Generator Trucks for remote heat treating applications. These truck-based, mobile heat treating systems are also know as Mobile Heat Treating Rigs.

Hotfoil-EHS will custom build a generator truck to your specification, with everything you need for a mobile, in-the-field heat treating system. Custom designs include a variety of generator sizes, power consoles, interior workspaces and layouts, air conditioning, and easy access to all electrical components. 

For more information, visit https://www.hotfoilehs.com or call 609.588.0900.