hardfacing and welding cost approaches ?

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i want to know what is meant by hardfacing in welding ?as i read when you determine the cost of welding : there are three approaches one is called cost per unit,cost per length , and cost per weight ( which the article said it is used for hardfacing applications requiring significant quantities of metal to be replaced by welding ) so i want to know what is the difference between them and what is meant by hardfacing application ??here is the site for welding cost approaches : http://weldingdesign.com/processes/n...760/index.htmlthanks in advance mohamed fatehy
Reply:hard facing is a process by which an extremely hard or wear resistant metal is overlayed on top of an existing piece of metal.  It is used to build up the edges of rock cutting cutting equipment or things like buckets for tractors.  http://www.welding-advisers.com/Hardfacing.htmlnow there's several approaches to weld costing. The difference being in how you set up the math.   If you calculate the cost per length.  you find the math to figure out the travel speed and how much it would cost for every Inch, foot or meter.  This is useful for thin joints that are very long, because usually the process that's faster or costs less per length is the right one to choose.Cost per weight, means that  you examine how much metal is deposited per minute or hour of welding.  On some types of welding like hard facing, the weld area may be big Or the weld process may be slow but it puts down a  lot of metal per minute. It's misleading to use cost per foot for things like hard facing because generally you don't lay down a singular bead, but a giant pad or rectangle shape.Attached is a welding cost excel spreadsheet.  If you input the variables it will show you the cost per length and deposition rate in  pounds/hrGood luck Attached Filesweldingcostestimatorpub.zip (13.0 KB, 181 views)Welding EngineerCertified Scrap Producer
Reply:dear Metarinka, first of all thank you very much for your kind reply but i want to ask you:i want to know if determining cost per length (foot) is wright for pipe welding ??this pipes is carbon steel pipes which may be large thickness and large diameter,also it will not be filled with only one pass as it may be required more than one pass and large amount may be deposited.so i want to know if it wright to calculate the cost ($/foot) for one pass and multiply it with total length of pass to determine the cost for the 1st pass and add the costs of the other passes for the same welding joint ?? is it wright or wrong .thank you very much .also i need to keep on touch with you on mail if you haven't mind [email protected] i am now making study for the cost analysis of pipe welding using most of data from this ( procedure handbook of arc welding by lincoln ) http://www.scribd.com/doc/9328867/Th...Of-Arc-Weldingand after study i deciding to implement expert system for determining the cost of pipe welding in large project . which is apart from my graduation project (management of pipe welding in large projects ) but usually the cost analysis of welding in different book speaks about cost for plates (cost/foot) so what is difference of pipes and plates ?? and how can i calculate the length of pipe ( which contain outer and inner diameter ) can i use the average diameter as a circumference (length) for the pipe and multiply it with the area to determine the volume .after succeeded implementation of program i will send it to you   thank you very much in advance for your help
Reply:Dear all i want to update my question if anyone can help me about previous and what is the difference between cost approaches ? especially for pipes .thanks alotLast edited by mohamed fatehy; 05-09-2010 at 09:27 PM.