WELDING OPERATIONS I - OD1651 - LESSON 1/TASK 1
nut, somewhat smaller than the bolt size, should be centered on
the bolt or stud to be removed.
A heavy-coated electrode is
lowered into the nut and an arc struck on the exposed end of the
broken bolt or stud. The nut is then welded onto the broken bolt
or stud and sufficient metal is added to fill the hole..
The
broken bolt or stud can then be removed with a wrench.
g.
Horizontal Position Welding.
(1) Tee Joints (figure 17, view C, on the previous page).
In
making tee joints in the horizontal position the two plates are
located approximately at right angles to each other in the form
of an inverted T.
The edge of the vertical plate may be tack
welded to the surface of the horizontal plate.
(a) A fillet weld (figure 18, views A and B, on the following
page) is used in making the joint by using a short arc to provide
good fusion at the root and along the legs of the weld.
The
electrode should be held at an angle of 45 degrees to the two
plate surfaces and inclined approximately 15 degrees in the
direction of welding.
(b) Light plates can be fillet welded in one pass with little
or no weaving of the electrode.
Welding of heavier plates may
require two or more passes with the second pass or layer made
using a semicircular weaving motion as shown in figure 18, view
C.
A slight pause is made at the end of each weave to obtain
good fusion between the weld and base metal without any
undercutting.
(c) A fillet-welded tee joint on 1/2 inch or thicker plate can
be made by depositing string beads in the sequence shown in
figure 18, view D.
(d) Chain or staggered intermittent fillet weldings as shown in
figure 19, view A, on page 44 are used for long tee joints.
Fillet welds of these types are used where high weld strength is
not required; however, the short welds are so arranged that the
finished joint is equal in strength to a fillet weld along the
entire length of a joint from one side only. Also, the warpage
and distortion of the welded parts are held to a minimum with
intermittent welds.
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