heat input for SMAW process,

Kammaran K.P. N. • The practice we used to follow to monitor the travel speed of an SMAW Procedure welding is by checking the total time taken to weld the full length of the Coupon Plate. But a lap of about 3 Seconds given between the two electrodes as there is an overlap of stop and start points. To monitor the travel speed as required in the proposed WPS, the weld coupon is marked at spacing of 4 or 6 Inches. The speed could me monitored during the completion of initial 4 / 6 Inches welding. This gives a chance of increasing or decreasing the speed as welding is in progress. As it is clear, the heat input has a very clear influence on the Notch toughness & Hardness properties. Low heat input gives better notch toughness property & high heat input gives better (less) hardness property. In practice, travel speed in SMAW process is not very critical, unless excessive weaving is done. But the travel speed is very critical in SAW, GMAW & FCAW processes.

Rachid B. • the welding speed on SMAW is not absolute but relative. As long as the rod is interacting with the base metal by pouring filler metal, that is by itself the derivative of the distance to be weld (dx/dt) which is the speed. When the welder stop to replace the elctrode, if it doesnt take more than 5% of the time to weld the part (sample of PQR) it can be incorporated as it is. To some extent just take the time of welding one single electrode on a weld length, and duplicate it on the whole weld length. As example if one electrode is used to weld 3" in 10sec use it as speed (18"/min) as example. Heat input basic equation is an analytical equation wich contains many variable and not just UxIx60/speed , but has other different parameters (process coefficients )which are not known to the publlic although they are used when doing weld modelisation.

Srinivasan I. • It is not difficult to measure the heat in put in SMAW process. We need to take the time taken for (arcing) for burning a single electrode and also measure the distance traveled. You may repeat the same three or four times in a single joint and arrive the average travel speed and then calculate