Svařování

Oblast zaměření: Svařování
Komise : CEN/TC 121 (Welding and allied processes)
Původce: CEN
K připomínkám do: 15.03.2019
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This part of ISO 21904 specifies two methods for establishing the minimum air volume flow rate. One method is dedicated for use with captor hoods, nozzles and slot nozzles with a ratio of slot length to hose diameter of 8:1 or less. The other method is dedicated for use with on-gun extraction devices.

Neither method is applicable to down draught tables.

Oblast zaměření: Svařování
Komise : CEN/TC 121 (Welding and allied processes)
Původce: CEN
K připomínkám do: 23.03.2019
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This part of ISO 21904 defines the general requirements for ventilation equipment used to capture and separate fumes generated by welding and allied processes e.g. arc welding and thermal cutting. It applies to the design and manufacture of parts of the equipment including hoods for welding, ducting, filter units, air movers, systems that inform of unsafe operation and workplace practices to ensure safe working with regard to exposure.

Significant hazards are listed in Clause 4. It does not cover electrical, mechanical and pneumatic hazards.

This part of ISO 21904 is applicable to the following:

—    local exhaust ventilation systems (LEV) excluding draught tables;

—    mobile and stationary equipment;

—    separation equipment used for welding and allied processes;

This part of ISO 21904 is not applicable to the following:

—    general ventilation, air make up or air movement systems;

—    air conditioning systems;

—    grinding dust.

This part of ISO 21904 also specifies the test data to be marked on the capture devices.

This part of ISO 21904 applies to systems designed and manufactured after its publication.

Oblast zaměření: Svařování
Komise : CEN/TC 121 (Welding and allied processes)
Původce: CEN
K připomínkám do: 23.03.2019
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This part of ISO 21904 specifies a method for testing equipment for the separation of welding fume in order to determine whether its separation efficiency meets specified requirements.

The method specified does not apply to testing of filter cartridges independent of the equipment in which they are intended to be used.

This part of ISO 21904 applies to equipment that is manufactured after its publication.

Oblast zaměření: Svařování
Komise : CEN/TC 121 (Welding and allied processes)
Původce: CEN
K připomínkám do: 25.03.2019
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This document specifies requirements for rubber hoses (including twin hoses) for welding, cutting and allied processes.

This document specifies requirements for rubber hoses for normal duty of 2 MPa (20 bar) and light duty [limited to hoses for maximum working pressure of 1 MPa (10 bar) and with bore up to and including 6,3 mm].

This document applies to hoses operated at temperatures −20 °C to +60 °C and used in:

—    gas welding and cutting;

—    arc welding under the protection of an inert or active gas;

—    processes allied to welding and cutting, in particular, heating, brazing, and metallization.

This standard does not specify requirements for hose assemblies; these are detailed in ISO 8207.

This document applies neither to thermoplastics hoses nor to hoses used for high pressure [> 0,15 MPa (> 1,5 bar)] acetylene.

Oblast zaměření: Svařování
Komise : CEN/TC 121 (Welding and allied processes)
Původce: CEN
K připomínkám do: 3.04.2019
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This part of IS0 9455 specifies two methods for the determination of the acid value of a flux of types 1 and 2 only, as defined in IS0 9454‑1.

Method A is a potentiometric titration method and is to be considered as the reference method.

Method B is an alternative, visual end‑point, titration method.