MIG wire classifications identify a wire’s chemical composition, strength and intended application. For example, ER70S-6 indicates a solid wire with a minimum tensile strength of 70 ksi and enhanced deoxidiser content. Understanding these codes — and the BS EN ISO and AWS standards behind them — helps ensure the correct filler wire is selected for the job.
This guide explains what wire classifications mean, the two key standards (BS EN ISO 14341 and AWS A5.18), and what defines a good robotic MIG welding wire.
What do MIG wire classifications mean?
MIG wire classifications identify the wire’s chemical composition, strength and intended application. For example, ER70S-6 indicates a solid wire with a minimum tensile strength of 70 ksi and enhanced deoxidiser content.
Understanding classifications helps ensure the correct filler wire is selected for the job. For how this applies to choosing wire, see our MIG wire selection guide.
What is BS EN ISO 14341?
BS EN ISO 14341 is the international standard covering solid wire electrodes and weld deposits for gas-shielded arc welding of non-alloy and fine-grain steels. It defines classification requirements including strength, impact properties and chemical composition.
Selecting consumables that comply with recognised standards helps ensure consistent quality and traceability. See also Welding Standards & Compliance.
What is AWS A5.18?
AWS A5.18 is the American Welding Society specification for carbon steel electrodes and rods used in gas-shielded arc welding. It includes classifications such as ER70S-6 and provides guidance on mechanical properties and chemical composition.
Many welding consumables are classified to both AWS and BS EN ISO standards, giving cross-referenced traceability for international work.
What is robotic MIG welding wire?
Robotic MIG welding wire is manufactured to deliver consistent wire feeding, stable arc performance and minimal downtime in automated welding systems. Consistency is essential because robotic welding relies on repeatable parameters to achieve reliable production quality.
High-quality wire also reduces contact tip wear and maintenance requirements — a key factor in keeping automated lines running.
Specifying compliant consumables
For coded welding and traceable work, the classification on the spool matters as much as the wire itself. Weldability SIF supplies MIG wires classified to recognised BS EN ISO and AWS standards — contact our technical team if you need consumables to meet a specific welding procedure specification (WPS).