One obvious answer is Size. You cant cast a 10 story building but you could Weld parts together to make a 10 or 100 story building, Although currently we generally use bolts to construct buildings out of parts. While a casting or Pressed unit are more structurally sound, it is more difficult to put in stress and flex points as opposed to welding.
STUB-IN STUB-IN STUB-IN
The minimum thickness for SMAW welding is about 18 ga. with a steady hand.
seam less pipes are having with out weld but produced by extension process it is costly than seam
In Europe and the Americas, scaffolds are typically constructed of steel tubing, which gives good stiffness at low cost. Some frame elements are welded together but other clip together so that the scaffold can be disassembled for shipment or storage. Planks for workmen to stand on are typically plywood. Bamboo is still used for scaffolding in south Asia. I have seen high quality steel scaffolding on large buildings in China. For small projects in the West, many builders will temporarily nail together 2x4" lumber to make a scaffold. The nails (or screws) can be removed so that the wood can be moved to another location and reused.
While the metal strength and durability of steel caskets is measured in gauge (ga.) - indicating the thickness of the metal - the strength of copper and bronze caskets is usually measured by the weight of the wrought metal sheets from which the caskets are welded together. The sheets used in standard solid copper or bronze caskets have a weight of 32 ounces per square foot, while more expensive caskets use 48oz sheets. Most 32 oz caskets have an empty weight between 200 and 300 lbs, most 48oz caskets between 250 and 350 lbs. In rare cases, 64 oz copper sheets or 96 oz bronze sheets are used for luxury caskets. Exceptions confirm the rule: the measurement in ounces per square foot is not used for top of the line copper and bronze caskets: copper deposit caskets (not welded from copper sheets, but made by a time consuming electrolytic process) usually have a wall thickness of 1/8" (3mm) and an empty weight of approximately 600 to 800 lbs, while cast bronze caskets (which are cast from molten bronze like bells) usually have a weight between 1,000 and 1,200 lbs, which equals that of solid bronze caskets made from sheets with a weight of at least 96 oz.
pressed, in most tac weld them when the fit is not as tight as the factory.
the advantage is that flanged joint more usable than the welded joint.
it is the method of which the product is constructed eg bike frames are welded and like plastic school chairs are moulded
Canadian Standard Association, Standard W59, covers welding requirements for carbon and low-alloy welded steel construction
It is called aluminum welding. Aluminum can be TIG welded, the most common method, or oxy-fuel welded, or stick welded, or MIG welded.
What have you welded ?
It is called aluminum welding. Aluminum can be TIG welded, the most common method, or oxy-fuel welded, or stick welded, or MIG welded.
Pipes that have been welded (or melted) together.
You grind a diamond by using drills or a diamond grinding cup wheel. A diamond grinding cup wheel is a metal-bonded diamond tool with diamond segments welded or cold-pressed on a steel.
Double submerged arc welded pipes has two types, one is spiral welded pipes, and the other is longitudinal welded pipes which are different from EFW pipes.
welded on
The term W W F stands for "Welded Wire Fabric," which is a prefabricated reinforcement consisting of a series of parallel longitudinal wires welded to cross wires at a required spacing. It is commonly used in concrete construction to provide additional structural strength and stability.