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Explain seam welding and percussion welding?
Seam welding- resistance welding process involving the use of (normally) copper or copper alloy rollers to simultaneously pass high current (10^4 amps and usually in pulses) and apply pressure to bond a lap seam between two pieces of sheet metal. Percussion Welding- arc welding process involving the use of a capacitor bank to bond on the order of milliseconds. A high current electric arc is developed between the items to be joined, and the items are rapidly accelerated together.
What do you mean by seam welding where it is used?
seam welding is a process that produces a weld at the faying surfaces of two similar metals where its used depends on which metal you look to weld
What the function of pinking shear?
Pinking shears create seam edges from fraying.
Why seam welding is better than that of spot welding?
The clue is in the question! If you weld a seam, or a spot which do you think is stronger? Take the example of the ordinary household radiator, it is seam welded, and they are usually watertight, it would be hard to make a waterproof seal with a spot welder and if you did try you would find it is very slow. A seam welder uses two rollers as the contacts instead of the copper rods, the rollers are inevitable faster as they can move along the piece easily and you get a perfect seal or seam when done, excellent.
What is the purpose of Standing Seam Metal Roof?
Standing seam metal roofs offer a better cooling effect than regular shingles. They are typically long panels which run from the top of the roof to the eaves. The seams are raised, protecting the underlay from leaks.
What are the different types of seam finishes?
The three types of seam are Plain seam, French seam and Ancient or Old German flat seam.
What is an advantage of a plain seam?
A plain seam is easy, and very simple.It helps the fabric lie flat.It's the most common seam.You don't need to change needles or settings for a plain seam.
What is a disadvantage of a plain seam?
It may end up fraying
How do you do a slot seam?
A slot seam is very simple. First baste a plain seam together. (A plain seam is simply two pieces of fabric sew together. You need to make sure that the seam is at least a half an inch wide.Second, press open the seam along its full length.Third, cut a strip of fabric as long as the entire seam and as wide as the now open seam width. This means it will be twice the width of seam.Fourth, pin or paste the strip of fabric to the opened seam, ensuring that the strip sits directly over the center of the opened seam.Fifth, turn the fabric so that the strip is underneath and you can sew from the 'finished' or right side of the project. Sew a quarter inch on both sides of the seam line.Finally, remove your basting. You have made a slot seam.
What is coal seam gas mining?
mining where they use seam gas
What are the points which determine the choice of seam?
You need to explain what seam you mean? A seam of coal? A seam in a jacket?
Where would you use a seam?
BOLLOCKS
What seam should you use on a jersey?
The Right Left Cross Upper Right Corner seam
What is flat -felled seam?
a flat fell seam is a type of stitch that joins materials together. you would use a flat fell seam for something like denim because it is the strongest type of stitch.
How can I effectively sew a seam closed?
To effectively sew a seam closed, first align the edges of the fabric and pin them together. Use a needle and thread to stitch along the seam, making small, even stitches. Knot the thread securely at the end to secure the seam. Press the seam flat with an iron for a neat finish.
What is a curved seam?
a curved seam is a seam that is curved
How to finish sewing a seam for a professional and polished look?
To finish sewing a seam for a professional and polished look, you can use techniques like backstitching at the beginning and end of the seam, trimming excess fabric, pressing the seam open or to one side, and using a zigzag stitch or serger to prevent fraying.
