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Home > Ordnance Documents and other related manuals > > Warping of Thin Plates.
Poor Weld Appearance.
Practical Exercise - od165180108

Welding Operations, I
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WELDING OPERATIONS I - OD1651 - LESSON 1/TASK 2
with downhand (flat position) electrodes unless the parts are
positioned properly.
Step 4.  Check for the proper joint preparation.
Make sure all
joints are properly prepared.
(5) Warping of Thin Plates.
Step 1.  Check for shrinkage of the deposited weld metal.  Select
an electrode with high welding speed and moderate penetrating
properties.
Step 2.  Check for excessive local heating at the joint.
Weld
rapidly to prevent excessive local heating of the plates adjacent
to the weld.
Step 3.  Check for proper preparation of the weld joint.
Avoid
an excessive root opening in the joint between the parts to be
welded.
Hammer the joint edges thinner than the rest of the
plates before welding.
Hammering elongates the edges and the
weld shrinkage causes them to pull back to the original shape.
Step 4.  Check the welding procedure.
Use either the special
intermittent or alternating welding sequence, or backstep or skip
welding procedure.
Step 5.  Check  the  clamping  of  parts.
Properly  clamp
parts
adjacent  to  the  joint.
Use  backup  fixtures  to  cool
parts
rapidly.
10. Conclusion
This  task  served  to  describe  the  theory,  principles,  and
procedures of welding armor plate; the methods of destructive and
nondestructive testing of welds, and the troubleshooting of welds
pertaining to electric arc welding.  This task completes the text
material of this lesson.
The next task consists of a practical
exercise which you are required to complete by providing the
answers to the questions.
102






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