MIL-DTL-22200/1H(SH)
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. This specification is intended to cover several low-hydrogen types of arc-welding electrodes
of various alloys and strength levels, capable of depositing weld metal that, in the as-welded or stress-relieved
conditions, meets mechanical property requirements given herein. It will be noted that, although these electrodes
may be used for some applications in the as-welded condition, they are capable of stress relief as required.
Properties may be affected by long time stress-relieving and slow cooling from stress-relieving temperature.
Properties should be determined to be satisfactory after a simulated production postweld heat treatment by the user
when required by the fabrication document. The designation, low hydrogen, is applied to electrodes having
coverings that are substantially free of any compound that may liberate hydrogen in the arc. Low-alloy steel
electrodes that produce low hydrogen in the arc have been found suitable for welding many steels that formerly gave
serious difficulty through excessive porosity and underbead cracking, unless welded with high-alloy electrodes.
6.1.1 Type MIL-7018-M. This type is intended to cover medium steel electrodes used in welding medium or
high-tensile steels and for attachment of such steels to high yield strength steels such as HY-80/100 and HSLA-
80/100. This electrode is intended for use with DCEP electrical characteristics only.
6.1.2 Type MIL-8018-C3. This type is intended to cover low-alloy electrodes capable of depositing weld metal
of higher strength than Type MIL-7018-M.
6.1.3 Type MIL-8018-C3SR. This type is intended to cover a special MIL-type electrode formulated to meet
the long time (50 hours) stress-relieved mechanical properties requirements only.
6.1.4 Type MIL-9018-M. This type is intended to cover low-alloy electrodes suitable for welding steels having
properties similar to those of the weld, and for welding attachments to HY-80 steel, as may be permitted. This
electrode is intended to be used with the DCEP electrical characteristics only.
6.1.5 Type MIL-11018-M. This type is intended to cover low-alloy electrodes for welding groove butt joints in
HY-80, HSLA-80, HSLA-100, and HY-100 steels where approved. This electrode is intended to be used with
DCEP electrical characteristics only.
6.1.6 All types with suffix RC. This type is intended to cover electrodes for welding pressure and strength
welds which will be subject to irradiation.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of this specification.
Type, class, and size required (see 1.2).
b.
Whether stress-relieving treatments are required (see 3.4.1).
c.
Whether the copper content is restricted as designated by the suffix RC to the MIL-type (see 3.5).
d.
Whether electrode identification includes heat or lot identification (see 3.6.1).
e.
For MIL-8018-C3SR, the length required (see 3.7).
f.
g.
h. For MIL-11018-M, when parameters other than those of table XIII are to be used (see table VI, footnote 3,
and table XIII, footnote 3).
i. For MIL-8018-C3SR, the stress-relieved condition required for conformance inspection (see table IX,
footnote 1).
j. Whether Types MIL-7018-M, MIL-9018-M, or MIL-11018-M are to be conformance inspected in the
stress-relieved condition (see table IX, footnote 2).
Whether mechanical property tolerances will not be used in retest as part of receipt inspection (see 4.5.3.3).
k.
l. Whether HSLA-80 or HSLA-100 steel and a 60 °F preheat/interpass temperature is used for evaluating
MIL-7018-M electrodes (see 4.6.2, and figure 1, footnote 3).
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