0. Given the following mechanism: how many degrees of freedom (DOF)?

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During sheet metal working the Seam Joint is formed by folding of sheet metal. Select one: True False

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2.Bolts and nuts are used for joining process. Select one: True False

The name of the edge preparation for welding shown in the following figure is O a. Double bevel O b. Single ) Oc single v 0d Single bevel

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The strength in the weld zone of an age-hardening aluminium alloy is often higher than in the heat affect zone (HAZ). Which of the following is NOT a reason for this? O The maximum temperature is higher in the weld pushing more of the hardening phase into solution. O Particles that don't dissolve might transform into equilibrium phases instead. This is more likely in the HAZ. O The greater dissolution of particles in the weld leads to greater solid solution strengthening. O The increase in solute in the matrix allows more subsequent natural aging to occur in the weld zone. O Particles in the HAZ tend to dissolve, while those in the weld coarsen. The increase in particle size and spacing reduces the strength of HAZ.