Material properties question

1) Three samples of aluminum are subjected to a constant stress and the times required to produce a constant strain of 0.1% during steady state creep at different temperatures are shown in table 1 below. Temperature (00C) 151 205 258 Time (hours) 100 1.0 0.028 Use this information to determine graphically. (i) The temperature at which a strain of 0.1% is produced after 10 hours. (ii) The activation energy for steady-state creep.

Need help with determining the rate of heat generation required at the welding source to accomplish a weld.

A fillet weld is used to join two medium carbon steel plates each having a thickness of 5.0mm. The plates are joined at a 90 degree angle using an inside fillet corner joint. The velocity of the welding head is 6mm/sec. Assume that the cross section of the weld bead approximates a right isosceles triangle with a leg length fo 4.5mm, the heat transfer factor is 0.80, and the melting factor if 0.58. Determine the rate of heat generation required at the welding source to accomplish a weld. the material is steel and the melting temperature is 1760 K