Some of the areas where we supply solutions are:
You can handle dimensions all the way from OD 3/8”-26”/10 mm–660 mm. This is possible because EFD Induction is the only induction heating supplier that can deliver power output of up to 2 MW.
Our range of solid-state welders is called Weldac, and you can choose from two basic designs: one-cabinet for low-power welders; two-cabinet for high-power welders. Modular design with independent full-bridge IGBT inverters makes Weldac compact, saving valuable floor space and simplifying in-line integration and retrofitting. Weldac can be fitted with induction coils and/or contact heads.
EFD Induction has developed a range of full body and seam annealing systems to meet your specific requirements. Common areas are annealing of high-grade steels and pipes produced according to different specifications such as API.
There are many advantages to choosing EFD Induction for tube and pipe annealing. These include: a constant power factor at all power levels, quick lifting of coils to avoid damage, continuous electronic automatic load matching, no need for operator intervention when changing tube size or wall thickness.
Within seam annealing there are two more smart EFD Induction solutions worth looking at in more detail: Traveling seam annealing and orbital seam annealing.
Traveling seam annealing moves the induction coils horizontally across the seam of the pipe seam. This ensures a uniform temperature all the way out to the ends of the pipes, thus minimizing waste.
With orbital seam tracking, an optical camera ensures constant heating of the weld. The camera simply follows the seam along a white tracking line painted on the pipe, and compensates for positional changes by rotating the induction coils (+/- 15°).
Induction produces quick, accurate, controllable and repeatable heat. This makes it an excellent method for preheating tubes and pipes to prevent cracking, reduce hardening structures and increase welding speed.
EFD Induction offers a series of solutions for induction preheating within tube and pipe. Some examples are heating prior to welding, tin remelting, galvanizing, pipe forming and bending, and application of plastic powder or paint to tube.
You can also use induction preheating to get better adhesion of insulation round heating pipes (compare with the process of adhering insulation round cables and wires).
Induction postheating is used in the tube and pipe industry to eliminate hardening structures, which may have arisen after welding. New steel quality guidelines, in particular APT, often demand reheating after welding.
Thanks to the accuracy and controllability of heat induction, it is possible to increase precision in postheating. This, in turn, produces pipes that are more durable, more resistant to cracks and less susceptible to corrosion.
High-output solid-state welders
The Weldac is EFD Induction's family of high-output solid-state welders based on rugged, reliable IGBT transistor inverters. A complete system, the Weldac consists of a frequency converter, output matching section, busbar, external control system and coil connection.
The Weldac system is available in two basic designs: single-cabinet for welders up to 600 kW; double-cabinet for welders up to 2,000 kW. Weldac is a proven solution for welding stainless steel, aluminum, low-carbon steel and high-strength steel.
Modular design with independent IGBT inverters makes Weldac compact, saving valuable floor space and simplifying in-line integration and retrofitting. The Weldac system can be fitted with induction coils or contact welding heads.