Lasaco sets standards in stud welding technology

Together with our partner KÖCO, we supply high-quality stud welding guns and other stud welding machines to customers all over the world. For every area of application, we have welding studs in our range that meet the specific requirements for quality and durability. In addition to supplying machines and other components, our experienced service technicians are, of course, also available to provide advice and assistance. Whether maintenance or repair - your machines and stud welding guns are always in the best hands with your solution partner Lasaco.

KÖCO - the internationally renowned specialist for fastening technology

We have been working successfully for many years with one of the world's leading manufacturers of joining technology. The high-quality KÖCO studs from our own production have been used for more than 60 years wherever safe, stable and durable connections by stud welding are required.

Our stud welding technology: This is how tip ignition works

Arc stud welding is a so-called arc pressure welding process. An arc is generated between the workpiece and the stud, which melts both parts. As soon as the correct welding time is reached and the stud can be immersed in the molten metal, the power supply is interrupted. Once the molten metal has cooled, the stud and metallic component have formed a permanent bond that is very robust and durable.

Our stud welding technology: This is how drawn arc ignition works

Another stud welding technique is the so-called drawn arc stud welding with ceramic ring. It is suitable for studs with diameters between 3 and 25 mm and is used with currents up to approx. 3000 amperes. The maximum welding time is approx. 3,000 ms. Initially, the positive pole of the current source is connected to the workpiece. If desired, a single-use ceramic ring can also be used in addition to the stud for protection. This is common for welding studs with diameters of more than 10 mm. The welding gun is then placed on the workpiece.

A lifting mechanism first lifts the stud so that an auxiliary arc or pilot arc of low amperage can be ignited. Only then does the main arc follow between the workpiece and the tip of the stud, the current intensity of which must be matched to the diameter of the stud. The melting and joining process takes place between the stud face and the workpiece. Once the set welding time has been reached, the stud welding gun moves the stud to the metal part and brings both melting zones together.

The greatest advantages of KÖCO - stud welding technology at a glance:

With KÖCO's proven stud welding technology, threaded bolts, pins, bushings, head bolts, anchoring elements and similar fasteners with a diameter of 2 - 25 mm can be welded on very quickly and over the entire surface. It does not matter whether the workpieces are sheets, tubes, profiles or other components.

This procedure has many advantages over other welding methods. For example, the component only has to be accessible from one side during welding. Drilling and the associated leaks can be avoided. The joint reliability is particularly high due to full-surface welding, while the short welding time advances productivity. Welding with stud welding equipment and studs from KÖCO's own production is possible in many different material combinations and produces hardly any distortion due to heat input. KÖCO's studs have international standardizations (EN ISO 14555 or EN ISO 13918); the headed studs also have a European Technical Approval (ETA-03/0039).

Questions and answers about stud welding technology

  • What is the operating principle of stud welding technology?

    An arc is ignited between the face of the welding stud and the respective workpiece. This melts the materials of the joining partners, which can then be joined together under comparatively low contact pressure. Welding with this method usually takes a maximum of one second.

  • When does the tip ignition come into play?

    Tip ignition is suitable for thin sheets from approx. 0.5 mm material thickness (but not less than 10 percent of the stud diameter) in a welding range from M3 to M8/M10.

  • When is the drawn arc ignition used?

    For thicker plates from a thickness of approx. 2 mm (but not less than 1/8 of the stud diameter), the drawn arc is used. It has a welding range for diameters between 2 and 25 mm (equivalent to M24).

  • How stable are the joints in stud welding?

    Stud welding achieves very high strength, the values of which even exceed those of the stud and the workpiece. This is achieved by the full-surface connection of the stud face and the workpiece.

  • Where is stud welding technology used?

    Tip ignition is used in general metalworking, plant engineering, vehicle construction and the electrical industry, among others. It is also used in laboratory and medical technology, in the manufacture of large kitchens and household appliances, in the food industry and in facade construction.

    Welding with drawn arc is used primarily in heavy industry, for example for steel and machine production, in shipbuilding and bridge construction, in structural and civil engineering, in plant construction and for the refractory insulation of power plant components.

  • What materials are suitable for welding with studs?

    Stud welding with tip ignition can be used for all materials listed in the mentioned standards, e.g. for alloyed and unalloyed steel, aluminum and brass. According to the standard, alloyed and unalloyed steel and aluminum are suitable for welding with drawn arc. Although welding of similar materials is recommended, other combinations may be possible.

How do you find the optimum welding process for your material?

Welding process Material
TIG welding All metals
MAG welding All steels
MIG welding Alloyed steels, non-ferrous metals
Laser welding All steels, light metals, glass
Electrode welding All steels
Resistance welding All metals
Stud welding (tip ignition) Carbon steel, stainless steel, brass
Stud welding (drawn arc) Unalloyed steel, stainless steel

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You want to weld under special operating conditions or need individual solutions for automation? You can send us your questions, requests and suggestions directly via the contact form - we will get back to you as soon as possible.

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LASACO cooperation partners at a glance

Since all customers have their own ideas, wishes and technical requirements for their individual order, we work together with strong partners. This is the only way to provide the required quality and reliability for applications in industry and trade. Here you will find an overview of the renowned manufacturers with whom we cooperate in the field of welding and robot technology as well as other components. Quality is our top priority. Always.