www.dworekprzeznaczenia.fora.pl

ierm8ec8

Spot welding is the name always attached with the resistance welding process. This has got the significance as the spot welding electrodes are subjected to the most [url=http://www.mxitcms.com/abercrombie/]abercrombie milano[/url] severe service of any current carrying member of the resistance welding process. [url=http://www.hollisterhanesmorgan.co.uk]hollister uk[/url] Through the weld area, these electrodes transmit both the welding current and the welding force. If you compare electrodes being used in the projection welding, flash or upset [url=http://www.achbanker.com/homes.php]hollister[/url] butt welding, they have an area of contact much greater than the weld area. Hence in such welding scenarios the current and force densities would be considerably less. However the spot welding electrodes are required to carry high current densities and this can be accomplished with effective water cooling.

Due to their significance in the spot welding process, it is important to select the proper electrode material as it assures correct current carrying capability. Resistance to electrode pick-up and sticking are other main factors which affect spot welding material selection. Both these factors depend upon the overheating of the electrode and work piece. If you [url=http://aquatwins.com/bbs/index.cgi/index.cgi]www.vivid-host.com/barbour.ht[/url] are wise in selecting the proper electrode material, the [url=http://gzlcg.com/wMcms_GuestBook.asp]woolrich o[/url] severity of these [url=http://www.1855sacramento.com/moncler.php]moncler outlet[/url] conditions can be reduced. The main intention of these alterations is to arrive at the ideal interface temperature between the electrode and the work piece.

While selecting the spot welding electrodes, you will find many alloys with each having its own advantages depending [url=http://www.sandvikfw.net/shopuk.php]hollister outlet sale[/url] on the application. Usually the alloys differ in the electrical conductivity, hardness or wear resistance and annealing or softening temperature of these materials. Even though the ideal electrode material can be defined as something with the compressive strength of steel and the electrical conductivity of silver, nothing of that sort is available presently. Hence the welding application would give more importance to high conductivity than electrode life and long service dressings.

If you compare copper alloys and its features, it can be seen that the increased wear resistance or hardness of alloyed copper is accompanied always by lower conductivity. This means that while selecting electrodes for spot welding, you need to go for the ones with least conductivity which would produce good welds on a given application. Also you need to consider the annealing or softening temperatures of electrode materials which are significant for the long life of the electrodes. It is also the function of the electrodes to conduct the current and to withstand the high forces so that an uniform contact area is maintained and a proper relationship is established between current, time [url=http://www.mansmanifesto.fr/category/doudoune-moncler/‎]doudoune moncler[/url] and force. For achieving satisfactory welds, you need to take care in the selection of proper electrode.

SPOT WELDING TIPS

Spot welding may be defined as a process in which [url=http://www.thehygienerevolution.com/barbour.php]barbour paris[/url] the contacting metal surfaces are joined by heat generated from resistance to electric current flow. Or still more simplistically, spot welding is one [url=http://www.davidhabchy.com]barbour sale[/url] of a group of resistance welding processes that involve the joining of two or more metal parts together in a localized [url=http://www.maximoupgrade.com/hot.php]hollister france[/url] area by the application of heat and [url=http://bbs.91d2.cn/read.php?tid=1]boots ugg pas cher Basic Strategies That Can Help Make An Infomercial Successful[/url] pressure. Work-pieces are held together under pressure exerted by electrodes. Typically the process uses two copper alloy electrodes to concentrate welding current into a small spot and to simultaneously clamp the sheets together.

-Radius style electrodes are used for high heat applications
-Electrodes with a truncated tip are for high pressure,
-Eccentric electrodes for welding corners
-Offset eccentric tips for reaching into corners and small spaces,
-Offset truncated for reaching into the workpiece itself.

It should be borene in mind that spot welding can be extremely perilous as large amounts of current and heat are involved. The welder must make sure to clamp the electrodes tightly, protect the eyes from the intense light that emanates and protect the hands because the workpiece can get very hot during welding. The other safety hazards are - the risk of crushing fingers or hands, the likely burn problems and possible eye injury from splash metal.

Automatic spot welding entails specific demands on resistance welding equipment. Often, equipment must be specially designed and appropriate welding procedures developed to meet robot welding requirements. Welding robots are of course available in various sizes, rated by payload capacity and reach. A spot welding gun applies needed pressure and current to the sheets to [url=http://www.mxitcms.com/tiffany/]tiffany outlet[/url] be welded. There are different types of [url=http://www.1855sacramento.com/moncler.php]moncler sito ufficiale[/url] welding guns available, to be used for [url=http://www.vivid-host.com/barbour.htm]barbour uk[/url] different applications.

There are some critical areas of spot welding where further researches are called for. The automotive industry is greatly interested in high strength and ultra-high strength steels, coated steels and aluminum alloys that can have welding problems. Although the problems are understood, further improvements in welding and electrode lives are still causing concern. There are also limitations in the ability of spot welding to join sheet to tube, which need to be addressed.