In 1923, the company's first welding generator developed and built in Finsterwalde, Ke 200/1450, was presented at the Leipzig spring fair.

Starting in 1935, the electrode pressing method improved the strength of the coating as well as welding quality compared to the previously standard dipping.

One major reference object for this new method is the so-called Kjellberg Hochbau, Germany's first building with an entirely welded steel frame construction.

In 1943, after just two months of development, Kjellberg introduced the so-called Maulwurf (mole) – the first industrial solution for automated submerged arc welding.

In 1959, the Professor Manfred von Ardenne Institute in Dresden carried out the first basic tests for plasma-arc cutting of high-alloyed steel and aluminium with argon-hydrogen in cooperation with Kjellberg Finsterwalde.

In 1979, a collective of researchers from Kjellberg and the Professor Manfred von Ardenne Institute were awarded the GDR National Prize for Science and Technology for their scientific and technical work developing the plasma melt cutting process.

In 1984, Kjellberg granted the O-A-Mach Corporation in Tokyo a licence to produce and sell plasma cutting torches, since the required quantities for the Japanese market could not be delivered in time due to lack of capacity in Finsterwalde.

In collaboration with Leibniz University Hannover and the HDW Kiel shipyard, multi-torch bevel aggregates were used for the first time in the "Shipbuilding 2000" project in 1993.

In the following year, the launch of the HiFinox technology for the first time worldwide permitted metallic clean and dross-free cuts on thin sheets of chromium nickel steel.

In 2004, a new record was established by using three FineFocus 800 plasma cutting machines connected in parallel for the dismantling of a disconnected nuclear reactor at the Karlsruhe Institute of Technology.

Kjellberg Finsterwalde Elektroden und Zusatzwerkstoffe GmbH inaugurated its new manufacturing facility at the Massen location.