Butt weldingFrom Wikipedia, the free encyclopedia

Butt welding is a welding technique used to connect parts which are nearly parallel and don't overlap. Itcan be used to run a processing machine continuously, as opposed to having to restart such machine witha new supply of metals. Butt-welding is an economical and reliable way of joining without using additionalcomponents.

Usually, a butt-welding joint is made by gradually heating up the two weld ends with a weld plate andthen joining them under a specific pressure. This process is very suitable for prefabrication and producingspecial fittings. Afterward, the material is usually ground down to a smooth finish and either sent on itsway to the processing machine, or sold as a completed product.

This type of weld is usually accomplished with an arc or MIG welder. It can also be accomplished bybrazing. With arc welding, after the butt weld is complete, the weld itself needs to be struck with ahammer forge to remove slag (a type of waste material) before any subsequent welds can be applied. Thisis not necessary for MIG welds however, as a protective gas removes any need for slag to appear. Anotherwith a MIG welder is that a continuous copper coated wire is fed onto the stock, making the weld virtually

inexhaustible.[1]

Contents

1 Hand welding2 Upset Weld3 Standards4 See also5 References6 Further reading

Hand welding

A joint between two members aligned approximately in the same plane. Butt welding can also be achievedthrough traditional blow torches in the most common form of butt joints, a process that uses some varietyof flux, usually a tin-based solder and precise hand-eye coordination that is common for hand-made boxesof copper, brass, and silver. There are two types of butt welding; one is carried out by smiting and anotheris carried out by welding two work pieces by non-overlapping.

The process consists of two desired strips of metal that are lined with flux that is lightly dried with ablowtorch until it is a sticky consistency, followed by cutting a strip of solder that is generally 20% of thefull joint's size. Applying heat gently makes the gel-like flux now appear white and powdery which now isprimed to be welded in which the blow torch is arched so that the "heat cone", the bluest and hottest partof the flame, is now directly upon the solder melting the joints together evenly.

The joint is then cooled and cleaned in a solution of sulfuric acid diluted in 20 parts water commonlyknown as "pickle" to remove imperfections. Sanding and polishing then achieves the desired finishing.

Upset Weld

The parts to be welded are clamped edge to edge in copper jaws of the welding machine and broughttogether in a solid contact so that their point of contact forms a locality of high electric resistance, whilecurrent flows to heat the joint . At this point the pressure applied upsets or forges the parts together .Upset buttwelding is used principally on non ferrous materials for welding bars, rods, wire, tubing, formedparts, etc.

Standards

EN 1993-1-8, which covers the design of joints in the design of steel structures, defines a set of provisionsfor welding structural steel.

See also

References

1. Britannica Concise Encyclopedia (2003) p. 1997

Further reading

The Science and Practice of Welding (10th Edition) By Arthur Cyril Davies(http://books.google.com/books?id=qF4fJJcW5vEC&pg=PA212)The science and practice of welding (6th Edition) By Arthur Cyril Davies(http://books.google.com/books?id=dJ9OAAAAIAAJ&pg=PA492)Welding Engineer, Vol.4 By American Welding Society (http://books.google.com/ebooks/reader?id=ofNYAAAAYAAJ&printsec=frontcover&output=reader)

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Fillet weld A weld of approximately triangular cross section joining two surfaces at approximatelyright angles to each other.Plug weldFlare groove weldWeld access holeWelding joint A joining process that produces a coalescence of metals (or non metals) by heatingthem to the welding temperature,

with or without the application of pressure, or by pressure alone, and

with or without the use of filler metals

Categories: Welding

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