Important Question in Electrical Welding
In this post, some of important questions of electrical welding is discussed which include advantages and disadvantages of seam welding, application of seam welding, projection welding, meaning of platens, applications of projection welding, percussion welding, upset butt welding and non-pressure welding.
Advantages and Disadvantages of Seam Welding
Describe the
advantages and disadvantages of the seam welding.
Advantages of
seam welding
- Efficient energy use
- As the filler material is not necessary therefore no fumes or gases generated.
- Two work pieces are joined by simply roll welding
- Gas tight and liquid tight joint is done by stitch welding
Disadvantages of
seam welding
- Complex control circuit
- If the metal thickness greater than 3 mm, it is difficult to weld
- Higher current requires as compared to spot welding
Applications of Seam Welding
State the applications
of the seam welding.
Applications
- Metal can be welded except copper and its alloy
- Welding of transformers, condensers, evaporators
- Fabricate gas or liquid tight metal tank
- Production of seam welded pipes
Describe the main
difference between projection welding and spot welding.
Projection welding
- There is high mechanical pressure applied on the metal pieces to be welded after the formation of the weld.
Spot welding
- No mechanical pressure applied
Platens
What are platens?
Platens
- It is flat metal plates used as electrode in the projection welding.
Projection welding
State the applications
of the projection welding.
Applications
- Mass production work
- Punching
- Welding of condensers
- Welding of refrigerators
Types of butt welding
Describe the different
types of butt welding.
Types of butt welding
- Upset butt welding
- Flash butt welding
- Percussion butt welding
How the upset butt
welding is done?
- The upset butt welding is done by joining metal parts end to end across secondary winding of the transformer.
Upset butt welding
State the application
of the upset butt welding.
Applications
- Welding of metal
end to end parts
- Welding of rods
- Welding of pipes
- Welding of wires
Describe the
advantages of flash butt welding over upset butt welding.
Advantages of
flash butt welding
- Low power requires
- Clean weld due to burning of foreign metals on the surfaces by arc.
Percussion Welding
On which principle the
Percussion welding is done?
Percussion
welding
- The percussion welding is done by using magnetic energy storage or capacitor energy storage principle.
State the applications
of the Percussion welding.
Applications of
Percussion welding
- Welding of dissimilar metals
- Welding of nickel alloy, aluminium alloy, copper alloy is done
- Welding of silver contact tips to copper
On which factors the
welding operation depends?
- The welding operation depends upon welding pressure, welding current and welding time.
Describe the effect of
welding current on the welding time?
- Lesser the welding current, higher the welding time and vice versa
Describe the
disadvantages of longer welding time.
- The longer welding time produces stronger weld but it produces distortion of the work piece and it consumes higher energy.
Non-pressure welding
Which type of welding
is known as non – pressure welding? Why?
Electrical arc
welding
- The electrical arc welding is known as non – pressure welding because the mechanical pressure is not necessary in this welding.
No comments:
Post a Comment