Punched terminal is normal for electric industry, how to make sure the connection between the wire and Pierced/Perforated/Punched Terminals? IPC/WHMA-A-620 defined the spec of the soldering quality. Below is the detail.
Target - Class 1,2,3
• Wire passes through the eye of the terminal.
• Wire wrapped to contact opposite sides of the terminal.
• Insulation clearance one wire diameter
Acceptable - Class 1
Process Indicator - Class 2
Defect - Class 3
• Wire wrap less than 90°.
• Wire does not pass through the eye of the terminal (not
shown).
Defect - Class 2,3
• Terminal altered to accept oversized wire or wire group.
• Conductor strands cut or modified to fit into the terminal.
Defect - Class 1,2,3
• Wire does not contact two sides of the terminal.
• Wire end violates minimum electrical clearance to noncommon
conductor (not shown).
• Wire is fractured at bends (not shown).
