Requirements for Soldered Electrical and Electronic Assemblies Flashcards
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According to IPC J-STD-001, what is the minimum solder coverage required on the lead end for Class 2 through-hole solder joints?
Answer: 100%
IPC J-STD-001 requires 100% solder coverage on the lead end (top of the board) for Class 2 through-hole solder joints.
Which flux type classification per J-STD-004 does NOT require cleaning after soldering when used within its activity level limits?
Answer: RO (Rosin)
RO (Rosin) flux residues are generally considered non-corrosive and do not require cleaning when activity levels are within specified limits.
What is the purpose of the 'wetting angle' measurement in solder joint evaluation?
Answer: To assess how well the solder has bonded and spread on the metal surface
The wetting angle (contact angle) indicates how well the solder has flowed and bonded to the base metal, reflecting the quality of the metallurgical bond.
Per IPC J-STD-001, a 'cold solder joint' is characterized by which visual appearance?
Answer: Dull, grainy, or frosted surface indicating incomplete fusion
Cold solder joints appear dull, grainy, or frosted because the solder did not reach proper reflow temperature, resulting in poor tin-lead or tin alloy crystallization.
What does the IPC J-STD-001 term 'minimum annular ring' refer to in PCB fabrication requirements?
Answer: The copper remaining between the drilled hole edge and the outer edge of the pad
The annular ring is the copper pad material remaining between the drilled hole and the outer edge of the pad, ensuring adequate mechanical and electrical connection.
Which soldering iron tip condition is required before applying solder to ensure quality joints per workmanship standards?
Answer: Properly tinned tip with fresh solder coating
A properly tinned soldering iron tip prevents oxidation, improves heat transfer efficiency, and produces consistent, high-quality solder joints.
Per IPC J-STD-001, which condition is an ACCEPT criteria for a chip component (0402 or larger) solder joint side overhang?
Answer: Overhang is less than or equal to 25% of the component width
IPC J-STD-001 accepts side overhang of 25% or less of the component width for chip components as a process indicator (not a defect) for Class 1 and 2.