How to make trolley machine in solidworks 

in this tutorial you will be able to know about weldment and features especially in weldment you will be able to know how can we create RHS, pipes, angle iron, u channel or c channel in the model.
weldment is useful in structure and simulation. and it saves a lot of time as compared with feature. another thing is you will be able to know about 3D sketch this tool is very useful for time saving.