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145
RESISTANCE WELDING
A group of welding processes in which fusion is produced by heat
obtained from resistance to the flow of electric current in a circuit of
which the workpiece is a part and by the application of pressure.
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.
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