In an arc welding operation on low-carbon steel to make a fillet weld, the cross

Question

In an arc welding operation on low-carbon steel to make a fillet weld, the cross?sectional area = 0.04 in2 and travel speed = 12 in/min. If the heat transfer factor = 0.95 and melting factor = 0.5, determine the rate of heat generation required at the heat source to accomplish this weld.

28.15 (USCS units) In an arc welding operation on low-carbon steel to make a fillet weld, the cross-sectional area 0.04 in2 and travel speed 12 in/min. If the heat transfer factor 0.95 and melting factor- 0.5, determine the rate of heat generation required at the heat source to accomplish this weld. Btu/min ? Table 28.2 Melting temperatures on the absolute temperature scale for selected metals and alloys. Melting Temperature Melting Temperature Metal Steels Metal Aluminum Aluminum alloys Cast iron, gray Copper and alloys 933 740-940 1400-1204 (1680) 1760 1700 1650 1700 (3160) (3060) (2970) (3060) (1325-1700 Low-carbon (2520-2660 Medium-carbon High-carbon Low-alloy 1357 1203-1273 1120 1660-1700 923 622-922 1725 Pure 2443 (2165-2292) Stainless steels (3000-3060)Martensitic (1120-1660) Titanium Brass 1670 1700 505 2070 693 2010 (3010) (3060) (909) (3725) (1247) Austenitic Bronze (90 Cu-10 Sn) Inconel Magnesium Magnesium alloys Nickel (1661) Tin (3107) Zinc Values calculated based on data in [2], [7], and Table 4.1 273. Kelvin scale- Centigrade (Celsius) temperature Rankine scale Fahrenheit temperature 460.

Explanation / Answer

From Table 28.2, Tm= 3165oR for low-carbon steel;

Um= 1.467(10-5)(3165)2= 146.95 Btu/in3

v= 12 = f1f2RH/UmAw= 0.95(0.5)RH/(146.95 x0.04) = 0.081 RH

RH= 12/0.081 = 148.1 Btu/min

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