Module 18 weld faults Flashcards
For each term answer whether it is a dimensional defect, structural discontinuity, or a defective property
A) overlap
B) insufficient Root opening
C) lack of fusion
D) warping
E) Filler metal composition
F) excessive reinforcement
G) incorrect joint preparation
H) incorrect weld size
I) excessive hardness
J) undercut
K) cracking
L) porosity
M) insufficient, tensile strength
N) slag inclusions
I) stray arc strikes
P) poor weld profile
A) overlap- dimensional defect
B) insufficient Root opening - dimensional defect before welding
C) lack of fusion- structural discontinuity
D) warping- dimensional defect
E) Filler metal composition - defective property
F) excessive reinforcement- dimensional defect
G) incorrect joint preparation - dimensional defect
H) incorrect weld size - dimensional defect
I) excessive hardness - defective property
J) undercut - dimensional defect after welding
K) cracking - structural discontinuity
L) porosity - structural discontinuity
M) insufficient, tensile strength - defective property
N) slag inclusions - structural discontinuity
I) stray arc strikes - structural discontinuity
P) poor weld profile - dimensional defect
Of the wild faults in question one found on page 35, which is considered the most serious explain your answer
Cracking is the most serious because cracks usually continue to spread and lead to complete weld failure
Cutting a notch into both ends of a weld and applying force against one end is known as a
A) stress, flow test
B) weld default test
C) weld press test
D) Nick brake test
D) Nick brake test
Not affect in a world has stress flow lines
A) concentrated at one point
B) flowing from left to right
C) flowing smoothly through the welded joint
D) stretched beyond the elastic limit
A) concentrated at one point
A taper transition ratio of 3:1 when joining plates of different thicknesses would
A) waste time and energy
B) decrease notch effect
C) decrease cross-section strength
D) create a point of high stress
B) decrease notch effect
A high concentration of stress in a weld causes
A) stress flow
B) high strength
C) a notch effect
D) a nick break
C) a notch effect
List three world faults that may be caused by each of the following.
A) inadequate heat input
B) excessive heat input
C) incorrect electrode angle
D) travel speed too slow
E) travel speed too fast
F) contaminated joint area (rust, scale, oil, or paint)
A) any of these: slag inclusions, porosity, lack of fusion, incomplete penetration
B) cracking, undercut, excess penetration
C) undercut, overlap, lack of fusion
D) overlap, excess convexity, excess penetration
E) any of these: cracking, lack of fusion, slag, inclusions, incomplete penetration
F) any of these: porosity, slag, inclusions, lack of fusion, cracking
An insufficient Root opening on a groove weld is likely to cause
A) lack of penetration
B) excessive penetration
C) complete fusion
D) stray ark strike
A) lack of penetration
Which of the following variables would be effective in controlling excessive penetration on a groove weld?
A) reduce the land thickness
B) increase the bevel angle
C) decrease the Root opening
D) preset the plates to widen the groove opening
C) decrease the Root opening
Porosity in a weld can be reduced by
A) cleaning the joint area before welding
B) welding with string beads instead of weave beads
C) maintaining a fast travel speed with the electrode
D) avoiding the use of low hydrogen electrodes
A) cleaning the joint area before welding
Undercut is most commonly caused by
A) current setting to low
B) travel speed too fast
C) using high iron powder electrodes
D) incorrect electrode angle
D) incorrect electrode angle
Distortion can be controlled by
A) making several passes using small electrodes at a low current setting
B) using a long arc length
C) using low hydrogen electrodes
D) maintaining accurate joint fit up
D) maintaining accurate joint fit up
Which of the following can cause quenched and brittle condition in metal
A) a stray arc strike
B) welding current set to low
C) and inadequately filled crater
D) using a damp electrode
A) a stray arc strike
Which situations would most likely produce slag inclusions in multi pass welds
A) Hi current setting with a short arc length
B) hi current setting with a normal arc length
C) low setting with a long arc length
D) removing the slag between passes
C) low setting with a long arc length
Longitudinal cracks in a world can be caused by
A) excessive travel speed
B) excessive joint restraint
C) arc length too long
D) incorrect electrode inclination
B) excessive joint restraint
