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IS0
FO R STA ND AR D I2 AT1 ON
I N T ER N AT I O NA L O RG A N I ZAT I O N
IS0 R E COM MEN DATI O N
R 544
DIAMETERS AND TOLERANCES FOR ELECTRODES
FOR MANUAL ARC WELDING
AND FILLER METALS FOR GAS WELDING
1 st EDITION
January 1967
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 544, Diameters aiid To1erances.for Electrodes for Manual
Arc Welding and Eiller Metals ,for Gas Welding, was drawn up by Technical Committee
ISO/TC 44, Welding, the Secretariat of which is held by the Association Française de
Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1949 and led, in 1953,
to the adoption of a Draft IS0 Recommendation.
In September 1957, this Draft IS0 Recommendation (No. 179) was circulated to all
the IS0 Member Bodies for enquiry. It was approved, subject to a few modifications of an
editorial na
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