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Automotive

The predominant welding method used in the manufacture of car bodies is the resistance spot welding method. Hand-held and robot welding guns as well as multispot welding machines are used.

In all cases the electrode force is applied via a compressed air cylinder or electric motor. The welding current needed to form the nugget is transmitted to the metal sheet by cables/strands, electrodes or holders and welding caps. Due to the different geometric shapes and different arrangements of the parts to be joined by welding, there is a wide variety of types and sizes of current conducting elements. Standard parts, which should be used as far as possible, are standardised in DIN EN ISO 2183 (shanks) and DIN EN ISO 5821 (electrode caps).

The standard material for electrode caps is Elmedur X (CuCr1Zr - A 2/2) or Elmedur XS (CuCr1Zr - A 2/3) for higher stresses. The holders are made of Elmedur X and preferably Elmedur HA or Elmedur NCS in the case of high welding forces.

Especially in case of welding coated sheets alloying of the contact area cause lower electrode life. Controlled increasing the electrical power helped initially when coated sheets had been welded. This method is no more economical and useful from the standpoint of energy consumption. . To maintain the same-sized spot diameter (as a function of the contact area) over the life of the electrodes, tip dressers are now generally used at robot and hand guns.

Modern weld controls support the efforts for constant weld quality.

Application

Caps, electrodes and electrode shanks according to German and international standards or to customer drawings as well as specifications.

Current metal prices

Officials (Prompt) 06/14/2019
Cu (Settlement) 5,805.50 in USD/t
Zn (Settlement) 2,575.00 in USD/t
EUR (Bid) 1.12295 USD
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