Nomenclature of processes and reference numbers (EN) ISO 4063

Welding plays a crucial role in industrial production as a joining technique for different materials. A variety of welding processes and techniques are used to produce both simple and complex joints.

In order to better organise and classify the various welding processes and their specific areas of application, classification numbers are often used. The classification numbers for welding processes provide both companies and welding experts with a system for clearly labelling and identifying the various welding processes.

They are based on the EN ISO 4063 standard and therefore enable efficient coordination and harmonisation of welding work. In times of an increasingly globalised market and growing international cooperation, the significance of serial numbers in the welding sector is becoming ever more important.

In this article, you will get an overview of the serial number system in welding and learn how this system contributes to the simplification and improvement of welding processes. Below is an overview of the most important welding processes:

Process numberWelding process
111Manual arc welding
112Gravity arc welding
114Metal arc welding with flux-cored wire electrode (without gas protection)
121Submerged arc welding with solid wire electrode
122Submerged arc welding with solid strip electrode
124Submerged arc welding with metal flux filler
125SAW welding with flux cored electrode
126SAW welding with flux cored electrode
131Gas metal arc welding with solid wire electrode
132Metal inert gas welding with flux-cored wire electrode
133Metal inert gas welding with metal powder-filled wire electrode
135Metal active gas welding with solid wire electrode
136MAG welding with flux-cored wire electrode
138Gas metal arc welding with metal powder-filled wire electrode
141Tungsten inert gas welding (TIG) with solid wire
142TIG welding without filler metal
143TIG welding with filler wire or filler rod
145TIG welding with reducing gas components and solid wire filler metal
146TIG welding with reducing gas components and flux cored filler wire
147TIG welding with active gas components
151Plasma metal arc welding
152Powder plasma arc welding
153Plasma spot welding
154Plasma beam welding
155Plasma beam plasma arc welding
211Indirect resistance spot welding
212Direct resistance spot welding
221Overlap roll seam welding
222Pinch seam welding
223Roll seam welding with edge preparation
224Roll seam welding with wire electrode
225Foil butt seam welding
226Foil overlap seam welding
231One-sided projection welding
232Double-sided projection welding
241Flash butt welding with preheating
242Flash butt welding without preheating
25Flash butt welding
26Resistance stud welding
27Resistance pressure welding with high frequency
311Gas welding with oxygen-acetylene flame
312Gas welding with oxygen-propane flame
313Gas welding with oxygen-hydrogen flame
41Ultrasonic welding
42Friction welding
421Friction welding with continuous drive
422Friction welding with flywheel drive
423Friction stud welding
43Friction stir welding
441Explosive welding
442Magnetic pulse welding
45Diffusion welding
47Gas pressure welding
48Cold pressure welding
49Hot pressure welding
51Electron beam welding
511EB welding under vacuum
512EB welding in atmosphere
513EB welding under shielding gas
521Solid-state laser welding
522Gas laser beam welding
523Diode laser beam welding / semiconductor laser welding
71Aluminothermic welding
72Electroslag welding
721Electroslag welding with strip electrode
722Electroslag welding with wire electrode
73Electro gas welding
741Induction butt welding
742Induction roller seam welding
743Induction high-frequency welding
753Infrared welding
783Stud welding with drawn arc
784Short cycle drawn arc stud welding
785Capacitor discharge stud welding with drawn arc
786Capacitor discharge stud welding with capacitor discharge tip ignition
787Stud welding with ring ignition
8Cutting and gouging
9Hard soldering, soft soldering and joint soldering
Serial numbers Welding processes according to DIN EN ISO 4063
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