The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies.

1. The following AWS standard (AWS standards are published by the American Welding Society, 550N.W.LeJeune Road, Miami, FL 33126) is referenced in the mandatory sections of this document:

AWS A5.01M/A5.01 (ISO 14344 MOD), Procurement Guidelines for Consumables – Welding and Allied Processes – Flux and Gas Shielded Electrical Welding Processes

2. The following ANSI standard (The ANSI standard is published by American Welding Society, 550N.W.LeJeune Road, Miami, FL 33126) is referenced in the mandatory sections of this document:

ANSI Z49.1, Safety in Welding, Cutting, and Allied Processes

3. The following ASTM standards (ASTM standards are published by the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428 - 2959) are referenced in the mandatory sections of this document:

ASTM E 29, Standard Practice for using Significant Digits in Test Data to Determine Conformance with Specifications

ASTM F 288, Standard Specification for Tungsten Wire for Electron Devices and Lamps

4. The following ISO standard (ISO standards are published by the International Organization for Standardization) is referenced in the mandatory sections of this document:

ISO 31 – 0:1922, Quantities and Units – Part 0: General principles; and Annex B, Rule A

 

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This specification prescribes the requirements for the classification of bare tungsten and oxide dispersed tungsten electrodes for gas tungsten arc welding and cutting and plasma arc welding and cutting. Classification is based on the chemical composition of the electrode. Standard sizes, finish, lengths, quantities, product identification, color coding, and chemical composition limits are specified.

This specification makes use of both U.S. Customary Unites and the International System of Units (SI). Since these are not equivalent, each system must be used independently of the other.

This specification adopts the requirements of ISO 6848:2004 and incorporates the provisions of earlier versions of AWS5.12, allowing for classifications under both specifications.



 

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This standard specifies requirements for classification of non-consumable tungsten electrodes for inert gas shielded arc welding, and for plasma welding, cutting, and thermal spraying.

This specification makes use of International System of Units (SI) and the U.S. Customary Unites. The measurements are not exact equivalents; therefore, each system must be used independently of the other without combining in any way when referring to material properties. The specification designated A5.12M uses SI Units; and the specification designated A5.12 uses U.S. Customary Units. The later units are shown within brackets or in appropriate columns in tables and figures. Standard dimensions based on either system may be used for sizing of tungsten electrodes or packaging or both under A5.12M or A5.12 specification.



 

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Tungsten carbide venturi nozzle has excellent uniform distribution of grinding compound. It is different with common straight type nozzle, which gathers the most of grinding compounds in the center of divergent area and narrow effective clean-up width, tungsten carbide venturi nozzle has wider effective clean-up width, more uniform grinding compound force. So that it can obviously improve the efficiency 15%--40% and reduce the consumption of the grinding compound.

In addition, there is a unique two-venturi nozzle, which has two nozzles at front and rear. Besides, there are some pores between two nozzles. Under the circumstances, it inhale surrounding air and make the volume of spraying is larger than the compressed air to accelerate the speed of grinding compound output. This diameter of two-venturi nozzle exit is longer than tungsten carbide venturi nozzle, smaller impulsion and 35% diverging area larger than normal nozzle so that the efficiency is improved.

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