CIS Soldering Techniques & Standards 2

Question 1

According to IPC J-STD-004, what does a flux activity designation of 'ROL0' indicate?

Accepted Answer

Rosin-based, low activity, no halide content

Answer

ROL0 means Rosin (RO), Low activity (L), and halide content of 0% (0), per IPC J-STD-004 flux classification.

Question 2

What is the maximum acceptable solder mask intrusion into a solder joint on a through-hole component per IPC-A-610?

Accepted Answer

Solder mask cannot reduce the minimum annular ring

Answer

Solder mask intrusion is acceptable as long as it does not reduce the minimum required annular ring below acceptance criteria.

Question 3

In IPC-A-610, which condition describes a through-hole solder joint where solder fills less than 75% of the barrel but wetting is acceptable?

Accepted Answer

Process Indicator

Answer

A through-hole barrel fill between 50% and 75% (Class 3) or 25% and 75% (Class 1/2) with good wetting is classified as a Process Indicator.

Question 4

Which soldering iron tip shape is best suited for drag soldering fine-pitch SMT components?

Accepted Answer

Chisel or hoof tip

Answer

A chisel or hoof tip provides a large flat surface ideal for drag soldering multiple fine-pitch leads in one stroke.

Question 5

Per IPC J-STD-001, what is the minimum preheat temperature requirement when hand soldering Class 3 assemblies with components sensitive to thermal shock?

Accepted Answer

Preheat is required to minimize thermal gradients; specific temperature per manufacturer specs

Answer

IPC J-STD-001 requires preheat to minimize thermal shock but defers specific temperatures to assembly documentation and component/material specifications.

(CIS) Certified IPC Specialist Practice Test

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CIS Soldering Techniques & Standards 2