Hollow welded assembled frame structure

A hollow welded assembled frame structure wherein a plurality of hollow members of a tubular shape are integrally assembled by connecting the hollow members to each other by welding, wherein:

• said hollow members include at least a first hollow member, a second hollow member, and a third hollow member;
• said first hollow member is closed at openings at opposite ends in a lengthwise direction thereof and has only one atmospheric air communicating hole provided at one end portion in the lengthwise direction thereof so as to communicate an internal hollow space thereof and the atmospheric air with each other;
• said second hollow member is welded at an opening at one end in a lengthwise direction thereof to a side face of said first hollow member in a state in which said second hollow member is abutted with the side face of said first hollow member and is connected in a communicating state through a first air vent port, which is provided at a connecting portion of said second hollow member and communicates the hollow spaces of said first hollow member and said second hollow member with each other;
• said third hollow member is closed up at openings at opposite ends in a lengthwise direction thereof and has a side face to which said second hollow member is welded at the other end thereof in a state in which the other end of said second hollow member is abutted with the side face of said third hollow member such that said third hollow member is connected to said second hollow member in a communicating state through a second air vent port, which is provided at a connecting portion of said third hollow member and communicates hollow spaces of said third hollow member and said second hollow member with each other;
• said first air vent port and said second air vent port are formed as hidden holes that are hidden by the second hollow member welded with the openings abutted therewith so as not to be observed from outside;
• and
• said first air vent port is provided at a position spaced by a predetermined distance from said atmospheric air communicating hole in the lengthwise direction of said first hollow member.