40 Questions
What is the primary advantage of welding joints in metalworking?
High strength and productivity
Which of the following is a disadvantage of welding joints in metalworking?
Warpage due to high local heat concentration
What is a necessary process after welding to ensure quality?
Non-destructive control of the joint
What makes welding joints indispensable for special manufacturing?
Ability to produce advantageous shapes from a deflection point of view
What is the recommended welding practice for corner joints at cold worked sheet metals?
Avoid welded joints at corners
Why should the rib not have an apex point during welding?
It melts during welding
What should be considered when designing spot welded joints?
Shearing resistance
What are some advantages of glued joints?
No heat affected zone
What is the physical effect bonding involving pressure-sensitive adhesives primarily based on?
'Stickiness' due to viscoelastic properties
What factor primarily determines the strength of a glued joint?
Kind of substrates
What is a disadvantage of glued joints?
Long preparation time
Which type of bonded joint involves smearing both surfaces and pressing them together?
'Contact' glues
What effect does ageing have on glued joints?
Reduces joint strength over time
What consideration should be made when calculating for static loads in welded joints?
Calculation of stresses in the weld
What is the primary purpose of avoiding skew connection at corner joints?
To enhance joint strength
What is the main calculation involved in checking resultant stress in welded joints?
Checking against ultimate stress
What is the purpose of using tapered lap joints, such as scarf joints and glueing belt ends?
To reduce stress congestion and improve structure
What is the advantage of soldered joints?
Low soldering temperature
What is the main disadvantage of soldered joints?
Relatively small load carrying capacity
What can reduce the stress congestion factor (α) in lap joints?
Using one-way lap joints
In what situation do one-way lap joints carry approximately twice the load of reverse-way joints with the same Young's moduli?
Loaded situation
What is the purpose of using glueing belt ends in lap joints?
To reduce stress congestion and improve structure
What is the role of solder in soldered joints?
To bond two metal objects together
What type of joint can help reduce stress congestion and improve the structure by reinforcing it with material removal?
Scarf joint
What can be used to reduce the stress congestion factor (α) in lap joints?
Short joints
What is a potential problem of incorrectly designed glued joints?
Potential failures
What type of lap joint carries approximately twice the load of the reverse-way joint under similar conditions?
One-way joint
What allows for the permanent joining of metal pieces in soldered joints?
Capillary force allowing molten solder to rise into cracks
Which welding technique is often used for welding thin materials and can be automated?
MIG
What type of joint construction principle recommends minimizing the number of welds?
Minimize number of welds
Which characteristic is true for the Heat Affected Zone (HAZ) in a welded joint?
Same chemical composition as weld metal
Which type of welded joint requires additional rework and has a big strength?
Butt joint
What is a good joint construction practice recommended to avoid?
Weld joints near stress peaks
Which welding technique is known for its high load capacity and the use of more material?
SAW
What type of welded joint has the best load capacity and requires additional rework?
Corner joint
Which characteristic is true for the weld bead in a welded joint?
Contains filler material
What is a good joint construction practice recommended to follow?
Avoid joints near stress peaks
Which welding technique is known for its versatility and can be used on a wide range of materials?
MIG
What type of welded joint has the advantage of using less material but may result in lower quality?
Lap joint
Which characteristic is true for the Heat Affected Zone (HAZ) in solid state welding?
Wider HAZ in solid state welding
Study Notes
- Welding techniques: MMA, MIG, TIG, FCAW, SAW, SMAW, Resistance, Forge, Friction, Induction welding
- Welded joints: Butt, Lap, Strap, Corner (best, cheap, bigger load capacity, good strength)
- Joint construction principles: Use high weldability material, minimize number of welds, avoid shaping based on casting or forging, select proper weld location and sequence
- Heat affected zones (HAZ) in welded joints:
- Weld metal (bead): Melted and re-solidified, contains filler material, different chemical composition, improved properties
- HAZ: Surrounding base metal, not melted, heated and cooled, same chemical composition, cannot improve properties
- HAZ and weld metal characteristics: Weld bead width, depth of penetration, reinforcement height, solid or fusion welding, narrower HAZ in fusion welding, wider HAZ in solid state welding
- Types of welded joints: Butt (big strength, rework needed), Lap (double weld metal, more material, less quality), Strap (big load capacity, more material), Corner (best, least material, biggest load capacity, additional rework)
- Good joint construction practices: Avoid joints near stress peaks, avoid welding lines crossings, weld joints at least 5v away from cold sections.
This quiz covers the construction of welded joints in cold worked sheet metals, focusing on the placement of welded joints at corners or bending curves. It also addresses the appropriate and inappropriate types of joints and considerations for dynamic loads.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
