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Design and material utilization C HAPTER 18.1
Extruded aluminium
Press moulded aluminium
Fig. 18.1-22 Sill sections produced from pressed parts compared with extruded sections. 9
forming limit curves, it was found that new disciplines in Regarding welding, instantaneous welding currents
the form of die adjustments, crowning and lubrication of 20 000–50 000 amps were now necessary compared
were essential if the required shapes were to be mass with 7000–12 000 amps for steel, and higher weld force
produced. values of 400–800 kgf compared with 200–300 kgf.
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