Welding Technology is gaining importance in the field of fabrication, reconditioning of worn parts, and has become principal joining process of numerous metal products of different sizes and shapes. The welded joints give the strength equal to that of original metal. With the increase in the importance of welding, estimation of welding cost has also become important, and therefore estimation of the welding cost is being discussed below.
Welding is the process of joining two or more metal pieces by heating them up to the desired temperature with or without the application of pressure and with or without the use of filler metal.
In case of gas welding following two welding techniques are adopted in practice:
(i) Leftward or Fore-hand welding.
(ii) Rightward or Back-hand welding.
In this type, welding is started from right hand side of the joint and proceeds towards the left hand side. This method is suitable for welding plates up to 3 mm thickness without edge preparation.
In this type, welding is started from left hand side of the joint and proceeds towards the right hand side. This method is suitable steel plates which are of more than 5mm thickness. In plates up to 8mm thickness, edge preparation is not required beyond 8mm thickness plates should be beveled to about 30 0.
Gas welding can only be done on plates up to 25mm thickness.
For estimating the welding cost, following cost elements should be considered.
a. Preparation Cost: It includes the cost of edge preparation, proper fit up and other elements before actual starting of welding.
b. Actual welding Cost: This includes two costs.
(i) Cost of material used in welding process like O2H2C2 filer rod, and flux etc.
(ii) Labor Cost. It will be obtained from wages sheets.
(iii) Welding Finishing Cost. This includes, the expenditure made for finishing the welding joint after welding. Post welding treatment (such as heat treatment) cost can also be taken in to account.
(iv) On-cost. All the other overheads on the equipment and other facilities considered under on-cost heading.
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