welding II chapter 6
What is the maximum root opening?
1/8 in (3 mm)
What is the maximum width of the root face?
1/8 in (3 mm)
The cover pass should not be more than ____________________ inch(es) wider than the groove opening
1/8"
Which of the following is true of the hot pass?
A very small amount of metal should be deposited so that the resulting weld is concave. can repair small spots or pinholes
How can a small gap between the plate and backing strip be removed?
By placing it on an anvil and striking it with a hammer.
When making a root weld with a straight step or "T", how do you get good root fusion to the backing strip?
By pushing the electrode into the root opening.
____________________ is the temperature of the metal during welding
interpass temperature
How much of the plate surface next to the weld groove must be mechanically cleaned to a bright finish before welding begins?
1 in. (25 mm)
To pass visual inspection prior to preparation for bend testing, which of the following is true of undercut?
It must not exceed 10% of the base metal or 1/32 in., whichever is less.
Which of the following is true of the cover pass?
It should be neat looking. no more than 1/8 in wider than groove opening
What can be done to prevent the weld bead becoming too built up when restarting a weld?
Tapering the weld down before stopping to make the restart more even.
Which of the following is true of open root welds?
The face side is not as important as the root surface on the back or inside.
A weld likely will fail testing if the weld contains ____.
a long string or large pieces of slag inclusions
Raising the end of the electrode too high or moving it too far ahead of the molten weld pool can cause ____.
all of the shielding gas to be blown away from the molten weld pool
____________________ is a process of cutting a groove in the back side of a joint that has been welded.
back gouging
The best way(s) to remove slag between filler weld passes is (are) ____.
chipping, wire brushing, and grinding
The last weld bead on a multipass weld is the ____.
cover pass
As the trailing angle of an electrode is ____, penetration, depth, and burn-through ____.
decreased, decrease
Wagon tracks are ____.
discontinuities resulting from failure to clean the convex root weld
What may need to be done to the root surface of a weld that is prepared on both sides before the next weld pass(es)?
ground or gouged clean
What are backup tapes made from?
high-temperature ceramics
The hot pass uses ____ to reshape the bead
higher-than-normal amperage and a fast travel rate
To keep a molten weld pool from becoming too large, ____ the travel speed, ____ the angle, shorten the arc length, or lower the amperage
increase, decrease
In the ____ method, the electrode is moved in and out of the molten weld pool as the weld progresses along the joint
key hole
A ____ arc prevents metal from being deposited ahead of the weld bead
long
The distance an electrode is moved from the molten weld pool and the length of time in the molten weld pool are found by watching the____.
molten weld pool
A key hole can be used ____.
on joints with wide, narrow, or varying root gaps
If all of the shielding gas is blown away from the molten weld pool, ____.
oxides can cause porosity
The ____ fuses the two parts together and establishes the depth of weld metal penetration.
root pass
What are some of the defects that the root weld face may have that are acceptable as long as the root surface is correct?
undercut and overlap
