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IS0
1 N T ER N AT I O NA L O R G A N I Z AT I O N FOR STA N D A R D I Z AT I O N
ISORECOMMENDATION
R 636
CODE OF SYMBOLS FOR FILLER RODS
FOR GAS WELDING OF MILD STEELS
AND LOW ALLOY HIGH TENSILE STEELS
1st EDITION
November 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 Switzeriand
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 636, Code of Syrnbols.for Filler Rods for Gas Welding
of Mild Steels and Low Alloy High Tensile Steels, was drawn up by Technical Committec
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 1955 and led, in 1958,
to the adoption of a Draft IS0 Recommendation.
L
In September 1958, this Draft IS0 Recommendation (No. 226) was circulated to all
the IS0 Member Bodies for enquiry. It was approved, subject to a few modifications of
an editorial nature, by the following Member Bodies:
Australia France Norway
Belgium Germany Poland
Bulgaria India Republic of South Africa
Burma Israel Spain
Czechoslovakia Italy Sweden
Switzerland
Denmark Japan
Finland Netherlands U.S.A.
Four Member Bodies opposed the approval of the Draft:
Austria
Canada
Romania
United Kingdom
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
1967, to accept it as an IS0 RECOMMENDATION.
Council, which decided, in November
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ISO/R 638-1967 (E)
IS0 Recommendation R 636 November 1967
CODE OF SYMBOLS FOR FILLER RODS
FOR GAS WELDING OF MILD STEELS
AND LOW ALLOY HIGH TENSILE STEELS
FOREWORD
This IS0 Recommendation is one of a set which also includes the following:
ISO/R 637, Methods of Test for Determining the Mechanical Properties of Weld Metal Deposited
by Filler Rods for Gas Welding Mild Steels and Low Alloy High Tensile Steels.
INTRODUCTION
a reference for the symboliza-
The mechanical properties of the deposited metal which serve as
tion of filler rods must be looked upon as conventional values resulting from the test methods
described in IS0 Recommendation R 637. They cannot be taken to characterize an assembly
welded with the same filler rods because the influence of the parent metal, of the welding pro-
cedure, of the heat treatment after welding or the absence of heat treatment, may cause substantial
changes in the conventional values found during the tests on
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