Weldotherm® heating and preheating elements

are robust heating elements which are particularly stable and durable, and optimally transfer heat to the workpiece.

Resistance units

Our premium heating elements heat the workpiece both reliably and accurately to the desired temperature. They are equipped with the "DINSE" plug system or also with the English Camlock system, if required. Available with Teflon or ceramic insulated tails.

Heating mats

As with all Weldotherm heating elements, our heating mats are made of aluminium oxide ceramics (96%) and semiconductor materials (NiCr 80/20). They are particularly robust and durable and are suitable for all kinds of pipe and vessel circumferential vessel welds, seam welded bends, nozzles and flange seams, in addition to surface heating. Application limit: 1050°C.

Heating tapes

These robust heating tapes can be customised to the workpiece particularly well and are the ideal heating element for circumferential welds on pipes, pipe walls and arches, bends and seams, that are difficult to access. In addition, they also serve to dress flanges and fitting connections. Application limit: 1050°C.

Spreader mats

Due to their flexible design, spreader mats always bring the optimum temperature to any desired part of the workpiece. Areas of application include point, flange and fitting weld seams, nozzle welds as well as conical and crowned workpieces. Application limit: 1050°C.

One-line-heating cables

Our one-line-heating cables has an outer sheath made of austenite wire mesh, making the shell flexible and heat-resistant. Ideal for welds on pressure vessels, flange connection welds and boiler walls, fittings and shaped part connection welds, in addition to superheater pipes, as well as small ones. Application limit: 1050°C.

Two-line-heating cable

Two-line-heating cables are suitable for the heat treatment of small pipes as well as for special applications.

Preheater

Preheater have a back insulation which is made of 25mm ceramic fibre in Inconel wire mesh and the back protector is made of stainless steel sheet. Application areas include circumferential welds on pipes, connections on pressure vessels, circumferential tank welds and longitudinal tank welds. Application limit: 450°C.

Magnetic Preheater

Our magnetic preheater are equipped with high temperature resistant magnets. Its back insulation is made of 25mm ceramic fibre in Inconel wire mesh and the back protector is made of stainless steel sheet. Application areas include circumferential welds on pipes, connections on pressure vessels, circumferential tank welds and longitudinal tank welds. Application limit: 450°C.

Flexible Heater – Wraparounds

If the same tube diameter must be heat treated often, the wraparounds save time and money. This flexible heaters are custom made for the appropriate diameter and reduce set-up times to a minimum, since no time consuming fixing of heaters and insulation material is required. Application limit: 950°C, for wraparounds with thermocouple bayonet elements max. 800°C.

Magnetic Heating Boxes

Three high temperature resistant specialist magnets independently hold the magnet preheater in its place. The back insulation is made of 25mm ceramic fibre in Inconel wire mesh, the back protector is a robust box construction made of stainless steel with handles for ease of use. Ideal for longitudinal plate welds in shipbuilding, on box girders of steel constructions and straight tank welds. Application limit: 450°C.

Channel Heaters

Weldotherm channel heaters are installed in robust stainless steel sheet metal boxes and are used for the heat treatment of column plate welds and large circumferential vessel welds as well as for the heating of temporary and stationary furnaces. Application limit: 850°C.

Inductive units

Weldotherm® offers coil and fixed inductors which can be used for a variety of applications. In addition, we also manufacture air- and water cooled inductors for units that are made by other manufacturers.

Coil inductor, air cooled

Our air cooled inductors consist of aluminium wire that is encased in a stainless steel and glass fibre protective tube. These robust coil inductors have proven themselves under harsh site conditions and heat workpieces up to 780 °C. They are thus suitable for all preheating and annealing processes.

Coil inductor, water cooled

Our water cooled coil inductors consist of copper wire and are insulated with a silicon Kevlar shell. Temperatures up to 1250 °C can be reached. These inductors are used when a high performance is required in a small area. Typical applications include the heat treatment of nozzles or of components with a complicated structure.

Custom designed inductors

Custom designed inductors are special inductors which are custom made for individual applications. They consist of a copper pipe with bend protection and are encased in a special VITON-KEVLAR insulation. They are suitable for non-contact preheating of components up to 500 °C. Typical applications are the preheating of rotating vessels and rollers.