25 Questions
What type of specimen testing is preferred for double-V-groove welds to reveal internal defects at the root?
Side-bend testing
Which hardness testing method uses a 10mm ball with 3000 kg force?
Brinell hardness testing
What is the unit of hardness given by the Vickers hardness test?
Vickers Pyramid Number (HV)
Which hardness scale uses a conical-shaped diamond indenter and a major load of 150 kg?
Rockwell C scale
What is the relationship between hardness and ductility?
High hardness indicates low ductility
Which hardness testing method uses a conical-shaped diamond indenter and a major load of 150 kg?
Rockwell C hardness testing
What is the relationship between hardness and tensile strength of steel?
Higher hardness indicates higher tensile strength
What type of indentation does the Vickers hardness tester use?
Square-based diamond pyramid
What is the unit of hardness given by the Vickers hardness test?
Vickers Pyramid Number (HV)
Which hardness testing method uses a 10mm ball with 3000 kg force?
Brinell hardness testing
What is the purpose of reviewing welder qualifications?
To ensure they are current and applicable to the work being carried out
What should be checked during visual inspection after welding?
Ensuring that all the required welds have been made
What is the purpose of inspecting joint preparation and fit-up?
To ensure the welding process being used is correct
What is the significance of identifying the weld size requirements?
To measure the throat and fillet weld sizes to ensure they are correct
What is the purpose of ensuring approved welding procedures are available?
To ensure the correct welding process is followed
Which method is commonly used to detect subsurface volumetric discontinuities in welds?
Radiographic inspection
What type of radiation is used in radiography for inspecting welds?
X-rays and gamma rays
What material is not possible to examine using magnetic particle inspection?
Aluminum
What is the purpose of establishing a safe zone and posting warning signs during radiography?
To ensure the safety of the radiographer
Which method is most sensitive for locating smaller discontinuities?
Wet fluorescent method
What is the distinguishing characteristic of chain intermittent fillet welds?
The alignment of weld segments, which must be opposite one another across the joint
What is the pitch of intermittent fillet welds defined as?
The distance between the centres of adjacent weld segments on one side of the joint
What is the significance of identifying the arrow side and the other side of a joint in welding symbols?
Determining which side of the joint the arrow points to and the opposite side
What is the purpose of specifying the length and position of fillet welds next to the fillet weld symbol?
To provide information about the weld dimensions
What type of intermittent fillet weld involves double-fillet welds in two lines with the centres of weld segments on each side of the joint being offset in relation to one another?
Staggered intermittent fillet welds
Study Notes
Weld Quality Control and Inspection Methods
- Side-bend specimen testing is preferred for double-V-groove welds to reveal internal defects at the root
- Hardness is the material's resistance to permanent deformation, with a relationship to mechanical properties and tensile strength of steel
- Hardness testing is commonly performed through indentation tests using Brinell, Vickers, and Rockwell methods
- The Brinell hardness tester uses a 10mm ball with 3000 kg force, with limitations in narrow areas such as the heat-affected zone
- The Rockwell hardness tester measures depth of penetration under different loads and indentors, commonly using the C and B scales
- The Vickers hardness tester uses a small indentation and allows for testing specific regions of the weld
- For Vickers testing, the indentation size should be measured and the distance between indentations should be at least 25 times the indentation size
- A high hardness indicates high strength and low ductility, with a relationship to the tensile strength of steel
- The Brinell, Vickers, and Rockwell hardness tests are based on the principle of indentation tests
- The Brinell hardness value is designated by the letters HB, while the Rockwell hardness is denoted by HRx
- The Rockwell C scale uses a conical-shaped diamond indenter and a major load of 150 kg, while the Rockwell B scale uses a 1/16 in steel ball and a major load of 100 kg
- The Vickers hardness test uses a square-based diamond pyramid indenter and the unit of hardness given by the test is known as the Vickers Pyramid Number (HV)
Test your knowledge of weld quality control and inspection methods with this quiz. Explore topics such as hardness testing, indentation tests, and specific testing methods like Brinell, Vickers, and Rockwell.
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