In riveted joint design for mechanical fabrication, identify the joint pattern in which rivets in successive rows are placed directly opposite one another.

Introduction / Context:
Riveted joints are classic permanent fastenings used in boilers, bridges, tanks, and pressure vessels. Two common pitch arrangements for multiple rows are chain and zig-zag (staggered). Recognizing these layouts helps in stress analysis, load distribution, and leak tightness considerations.

Given Data / Assumptions:

• Multiple rows of rivets connect overlapping plates.
• Row pitch and transverse pitch are set per design codes.
• We compare geometric patterns only.

Concept / Approach:
In chain riveting, rivets in adjacent rows lie on the same transverse line, i.e., directly opposite each other. In zig-zag riveting, rows are staggered, so rivets in one row lie midway between rivets in adjacent rows. Diamond patterns are specialty layouts, not typical for straight lap joints.

Step-by-Step Solution:

Verification / Alternative check:
Design handbooks illustrate chain riveting with coincident rivet centers in adjacent rows along the same transverse pitch line.

Why Other Options Are Wrong:

• Zig-zag: explicitly staggered, not opposite.
• Diamond and hybrid patterns: specialized arrangements, not the standard “opposite” definition.
• Crossed: not a standard term for row layout in lap joints.

Common Pitfalls:
Confusing “pitch” terminology (longitudinal vs transverse) and misreading simple diagrams.

Final Answer:
Chain riveting