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Questions and Answers
What is convexity in welding defined as?
What is convexity in welding defined as?
- The minimum distance from the face of a convex fillet weld parallel to a line joining the weld toes
- The distance from the center of a convex fillet weld to the weld toes
- The distance from the root of a convex fillet weld to the face of the weld
- The maximum distance from the face of a convex fillet weld perpendicular to a line joining the weld toes (correct)
What may excessive convexity lead to in multipass welds?
What may excessive convexity lead to in multipass welds?
- Notch effects (correct)
- Reduced stress risers
- Improved fusion
- Decreased porosity
What are some probable causes of convexity in welding?
What are some probable causes of convexity in welding?
- Incorrect work and travel angles (correct)
- Proper welding parameters
- Correct electrode size for the application
- Absence of surface contaminants
How can excessive convexity on fillet welds be corrected?
How can excessive convexity on fillet welds be corrected?
What is the maximum permitted reinforcement according to CSA Standard W59?
What is the maximum permitted reinforcement according to CSA Standard W59?
How can insufficient throat in a fillet weld be corrected?
How can insufficient throat in a fillet weld be corrected?
What is the probable cause of undercut discontinuities?
What is the probable cause of undercut discontinuities?
How should excessive undercut be prevented?
How should excessive undercut be prevented?
What is the consequence of underfill in a weld?
What is the consequence of underfill in a weld?
How can insufficient leg size in a fillet weld be corrected?
How can insufficient leg size in a fillet weld be corrected?
What does surface undercut in a weld indicate?
What does surface undercut in a weld indicate?
What is the consequence of convexity caused by insufficient heat input?
What is the consequence of convexity caused by insufficient heat input?
What is the potential consequence of excessive weld reinforcement?
What is the potential consequence of excessive weld reinforcement?
When can undercut occur in the welding process?
When can undercut occur in the welding process?
How can underfill be caused in a weld?
How can underfill be caused in a weld?
How can the limitations of undercut be determined?
How can the limitations of undercut be determined?
What is concavity defined as in fillet welds?
What is concavity defined as in fillet welds?
How can excessively concave fillet welds be corrected?
How can excessively concave fillet welds be corrected?
What can cause concavity in fillet welds?
What can cause concavity in fillet welds?
How can the leg and throat size of concave fillet welds be measured?
How can the leg and throat size of concave fillet welds be measured?
What can result from out-of-line weld beads in a joint requiring complete joint penetration?
What can result from out-of-line weld beads in a joint requiring complete joint penetration?
What is incomplete fusion in welding?
What is incomplete fusion in welding?
What may cause incomplete fusion in welding?
What may cause incomplete fusion in welding?
How can weld deficiencies due to poor profile be detected?
How can weld deficiencies due to poor profile be detected?
What is the consequence of out-of-line weld beads in a joint requiring complete joint penetration?
What is the consequence of out-of-line weld beads in a joint requiring complete joint penetration?
What is the potential consequence of excessively concave fillet welds?
What is the potential consequence of excessively concave fillet welds?
What is the maximum permitted reinforcement according to CSA Standard W59?
What is the maximum permitted reinforcement according to CSA Standard W59?
How can weld deficiencies due to insufficient or excessive size be detected?
How can weld deficiencies due to insufficient or excessive size be detected?
What is concavity defined as in a fillet weld?
What is concavity defined as in a fillet weld?
What can cause concavity in fillet welds?
What can cause concavity in fillet welds?
How can excessively concave fillet welds be corrected?
How can excessively concave fillet welds be corrected?
What can result in incomplete joint penetration when complete joint penetration is required?
What can result in incomplete joint penetration when complete joint penetration is required?
What is incomplete fusion in welding?
What is incomplete fusion in welding?
How can weld deficiencies due to insufficient or excessive size and poor profile be detected?
How can weld deficiencies due to insufficient or excessive size and poor profile be detected?
What can be used to measure the leg and throat size of concave fillet welds?
What can be used to measure the leg and throat size of concave fillet welds?
What may cause incomplete fusion in welding?
What may cause incomplete fusion in welding?
How can large diameter pipes with external undercut defects be repaired?
How can large diameter pipes with external undercut defects be repaired?
What is shown in Figure 19 of the text?
What is shown in Figure 19 of the text?
What is shown in Figure 23 of the text?
What is shown in Figure 23 of the text?
What is the correct method for repairing small diameter pipe undercut defects?
What is the correct method for repairing small diameter pipe undercut defects?
Study Notes
Welding Defects and Corrections
- Large diameter pipes can be repaired using the same method as external undercut.
- Small diameter pipe undercut defects require cutting out the section and preparing a new joint.
- Acceptable and unacceptable groove weld profiles are shown in Figure 19.
- Concavity is defined as the maximum distance from the face of a concave fillet weld to a line joining the weld toes.
- Operator techniques and welding parameters can cause concavity in fillet welds.
- Excessively concave fillet welds can be corrected by adding more weld passes.
- Desirable, acceptable, and unacceptable fillet weld profiles are shown in Figure 23.
- Weld deficiencies due to insufficient or excessive size and poor profile may be detected visually or by using suitable gauges.
- The leg and throat size of concave fillet welds can be measured with fillet weld gauges.
- Out-of-line weld beads can result in incomplete joint penetration when complete joint penetration is required.
- Incomplete fusion is the failure to fuse between weld metal and fusion faces or adjoining weld beads.
- Incomplete fusion may be caused by factors such as improper electrode selection, welding parameters, and joint design.
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Description
Test your knowledge of welding discontinuities and defects with this quiz. Learn about the causes of discontinuities such as undercut, concavity, and incomplete fusion, as well as the corrective measures to address these issues. Understand the impact of welding parameters and joint preparation on weld quality.
