Regulation ISO EN11611 Welding

Protective clothing for use in welding and allied processes.

The aim of this standard is to define the requirements that the design as well as the thermal protection may require for the manufacture of the clothing used by welders and similar. These garments have to protect the person against small metal splashes, the short flame contact and against the radiant heat.

It also defines some minimum parameters that fabrics have to comply, regarding the tear resistance, molten splashes, seams and the electric resistance.

This standard classifies the garment or the fabric in two protection levels depending on the drops of molten metal that the fabric may hold before the temperature of the calorimeter increases 40ºK. These levels are:

• Class 1: minimum 15 drops.
• Class 2: minimum 25 drops.

There are also two classifications for the radiant heat:

• Class 1: RHTI24≥ 7 seconds.
• Class 2: RHTI24≥ 16 seconds.

The minimum requirements for the rest of the parameters are:

Requirements Standard Minimum Value
Tensile strength (warp and weft) EN 13934-1 400 N        
Tear strength (warp and weft) EN 13937-2 20 N        
Seam strength (warp and weft) EN 13935-2 225 N        
Electric resistance EN 1149-2
> 105 Ω

Selection criteria for welders’ clothing:

Type of welders’ clothing Selection relating to the process: Selection criteria relating to the environmental conditions:
Class 1

Manual welding techniques with light formation of spatters and drops, e.g.:
-gas welding,
-TIG welding,
-MIG welding,
-micro plasma welding,
-spot welding,
-MMA welding (with rutile-covered electrode).

Operation of machines, e.g. of: -oxygen cutting machines,
-plasma cutting machines,
-resistance welding machines,
-machines for thermal spraying
-bench welding
Class 2
Manual welding techniques with heavy formation of spatters and drops, e.g.:
-MMA welding (with basic or cellulose-covered electrode),
-MAG welding (with CO2 or mixed gases),
-MIG welding (with high current),
-self-shielded flux cored arc welding
-plasma cutting,
-oxygen cutting,
-thermal spraying

Operation of machines, e.g.:
-in confined spaces,
-at overhead welding/cutting or in comparable constrained positions