Английский для сварщиков. Гричин С.В. - 168 стр.

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168
REVERSE POLARITY:
The arrangement of direct current arc welding leads in which the work
is the negative pole and the electrode is the positive pole of the
welding arc.
ROCKWELL HARDNESS TEST:
In this test a machine measures hardness by determining the depth of
penetration of a penetrator into the specimen under certain arbitrary
fixed conditions of test. The penetrator may be either a steel ball or a
diamond spherocone.
ROOT:
See ROOT OF JOINT and ROOT OF WELD.
ROOT CRACK:
A crack in the weld or base metal which occurs at the root of a weld.
ROOT EDGE:
The edge of a part to be welded which is adjacent to the root.
ROOT FACE:
The portion of the prepared edge of a member to be joined by a groove
weld which is not beveled or grooved.
ROOT OF JOINT:
That portion of a joint to be welded where the members approach
closest to each other. In cross section, the root of a joint may be a
point, a line, or an area.
ROOT OF WELD:
The points, as shown in cross section, at which the bottom of the weld
intersects the base metal surfaces.
ROOT OPENING:
The separation between the members to be joined at the root of the
joint.
ROOT PENETRATION:
The depth a groove weld extends into the root of a joint measured on
the centerline of the root cross section.
SCARF:
The chamfered surface of a joint.
SCARFING:
A process for removing defects and checks which develop in the
rolling of steel billets by the use of a low velocity oxygen deseaming
torch.
SEAL WELD:
A weld used primarily to obtain tightness and to prevent leakage.
SEAM WELDING:

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