Exam 6: Shielded Metal Arc Welding Aws Sense Certification
Describe the preparation of a weld specimen for bend testing.
Correct weld specimen preparation is essential for reliable results.The weld must be uniform in width and reinforcement and have no undercut or overlap.The weld reinforcement and backing strip, if used, must be removed flush to the surface.They can be machined or ground off.The plate thickness after removal must be a minimum of 3/8 in.(10 mm), and the pipe thickness must be equal to the pipe's original wall thickness.The specimens may be cut out of the test weldment using an abrasive disc, by sawing, or by cutting with a torch.Flame-cut specimens must have the edges ground or machined smooth after cutting.This procedure is done to remove the heat-affected zone caused by the cut.
All corners must be rounded to a radius of 1/8 in.(3 mm) maximum, and all grinding or machining marks must run lengthwise on the specimen.Rounding the corners and keeping all marks running lengthwise reduce the chance of good weld specimen failure due to poor surface preparation.
What holds the filler metal in place on an open root weld?
A
Plates that are thicker than ____________________ inch(es) can be grooved on both sides but may be prepared on only one.
3/8
three eighths
three-eighths
The ____________________ refers to the edge of the metal burned back slightly by the electrode just ahead of the molten weld pool.
The ____ fuses the two parts together and establishes the depth of weld metal penetration.
What can be done to prevent the weld bead becoming too built up when restarting a weld?
The best way(s) to remove slag between filler weld passes is (are) ____.
What advantage is there to making a root weld with a smooth uniform root contour?
Summarize the criteria for visual inspection prior to preparation for bend testing.
Explain what interpass temperature is, including minimum and maximum interpass temperatures.
____________________ is a process of cutting a groove in the back side of a joint that has been welded.
How much of the plate surface next to the weld groove must be mechanically cleaned to a bright finish before welding begins?
The cover pass should not be more than ____________________ inch(es) wider than the groove opening.
Raising the end of the electrode too high or moving it too far ahead of the molten weld pool can cause ____.
If all of the shielding gas is blown away from the molten weld pool, ____.
When making a root weld with a straight step or "T", how do you get good root fusion to the backing strip?
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