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UDC 621.791.753 : 620.113
IS0
S TA N DA RD IZATl ON
I NT ERN AT1 O N A L O RG A N IZATl ON FO R
IS0 RECOMMEN DATION
R 876
SPECIAL METHOD OF MECHANICAL TESTING
TO DETERMINE THE CODING FOR DEEP PENETRATION ELECTRODES
1st EDITION
November 1968
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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 876, Special method of mechanical testing to determine the
coding for deep penetration electrodes, 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 1961 and led, in 1963, to the
adoption of a Draft IS0 Recommendation.
In October 1966, this Draft IS0 Recommendation (No. 1040) 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 :
Romania
Argentina Greece
India South Africa, Rep. of
Australia
Ireland Spain
Belgium
Brazil Israel Sweden
Canada Japan Switzerland
Czechoslovakia Korea, Rep. of Turkey
Denmark Netherlands U.A.R.
Finland New Zealand United Kingdom
U.S.S.R.
France Norway
Yugoslavia
Germany Portugal
One Member Body opposed the approval of the Draft :
U.S.A.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council,
which decided, in November 1968, to accept it as an IS0 RECOMMENDATION.
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FOREWORD
This IS0 Recommendation is one of a series which also includes the following :
ISO/R b35, Code of symbols for covered electrodes for arc welding of mild steels and low
alloy high tensile steels;
Methods for determining the mechanical properties of the weld metal deposited
ISOlR 61 5,
by electrodes 3.15 mm or more in diameter;
ISO/R 632, Methods of test for determining whether an electrode is a deep penetration
electrode.
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ISO/R 876-1968 (E)
IS0 Recommendation R 876 November 1968
SPECIAL METHOD OF MECHANICAL TESTING
TO DETERMINE THE CODING FOR DEEP PENETRATION ELECTRODES
INTRODUCTION
Owing to the special applications of deep penetration electrodes, the method of depositing the weld
metal differs from that in normal welding practice. Tests on welded joints are therefore necessary.
The results obtained will not be comparable with those of all-weld tests with normal penetration
electrodes, but they will nevertheless allow symbols to be allotted to the different types of deep
penetration electrodes in accordance with IS0 Recommendation R 635, Code of symbols for
covered electrodes for arc welding of mild steels and low alloy high tensile steels.
1. SCOPE
This IS0 Recommendation describes a special method of mechanical testing to determine the coding
for deep penetration electrodes. The method consists of taking, from a welded assembly, tensile test
pieces and V-notch test pieces for impact testing.
Because high tensile strength, deep penetration electrodes are very seldom made or used, it would have
needlessly complicated IS0 Recommendation R 635 to take such electrodes into account. Accord-
ingly, only one type of steel has been specified for the parent metal.
2. TEST ASSEMBLY - QUALITY AND DIMENSIONS
The test assembly for mechanical testing should consist of two plates each of minimum dimensions
150 mm X 400 mm (see Fig. 1). The thickness should be 12 mm in order to ensure that impact test
pieces can be machined out, and the gap e between the edges should be not more than 1.5 mm. The
parent metal should be a mild steel, killed or semi-killed, with a tensile strength between 42 and
50 kgf/mm2 in the as-rolled condition, and should meet the following requirements for chemical
composition :
Carbon < 0.18 O/'
Sulphur < 0.04 'lo
Phosphorus Q 0.04 'lo
3. WELDING PROCEDURE
Electrodes of 4 or 5 mm diameter should be u
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