Method of manufacturing automotive body including automotive crashworthiness energy absorption part

A method of manufacturing an automotive body including an automotive part that axially crush when a load is input from a front side or a rear side of the automotive body, the method comprising:

• manufacturing the automotive part;
• and
• assembling the automotive body by attaching the manufactured automotive part to a front portion or a rear portion of the automotive body,
• wherein the manufacturing the automotive part includes:
• manufacturing a pre-coated part including
• a hollow tubular member having a trapezoidal cross section and formed using a hat-shaped section member including a top portion, side wall portions and corner portions connecting the top portion and the side-wall portions;
• and
• a coating part having quality of material with a strength lower than that of the tubular member, the coating part being disposed with a gap of 0.2 mm to 3 mm on an outer surface of a portion including the corner portions connecting the top portion and the side wall portions in the tubular member;
• and
• forming a coating film in the gap by
• forming a coating layer by electrodeposition coating in at least the gap in the pre-coated part, and
• thermally curing the coating layer.