IPC-A-600H-2010 中文版 印制板的可接受性 (1).pdf - 第38页

Nonconforming - Class 1,2,3 (不符合条件 - 1,2,3级) • Defects either do not meet or exceed above criteria. • 缺陷不符合或 超 出上述要求。 图 242d 2.4 SOLDER COA TINGS AND FUSED TIN LEAD (焊料涂覆层和热熔锡铅层) 2.4.2 Dewetting (cont.) (退润湿(续) ) 30 IPC-…

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Dewetting: A condition that results when molten solder coats a surface and then recedes to leave irregularly-shaped mounds of solder that
are separated by areas that are covered with a thin film of solder and with the basis metal not exposed.
退润湿:覆在表面上回缩导致覆盖且未基材或表面的区域分的不
规则的一种状况。
Target Condition - Class 1,2,3(⽬标条件 - 1,2,3级)
No dewetting.
无退湿
Acceptable - Class 2,3(可接受条件 - 2,3级)
On conductors and ground or voltage planes.
On 5% or less of each land area for solder connection.
体上和接地上有退湿
个焊退湿的面于或等于5%
Acceptable - Class 1(可接受条件 - 1级)
On conductors and ground or voltage planes.
On 15% or less of each land area for solder connection.
体上和接地上有退湿
个焊退湿的面于或等于15%
242b
242c
242a
注:此图仅⽤作说明状况,并不要求做显微剖切评价。
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2.4 SOLDER COATINGS AND FUSED TIN LEAD(焊料涂覆层和热熔锡铅层)
2.4.2 Dewetting(退润湿)
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Nonconforming - Class 1,2,3(不符合条件 - 1,2,3级)
Defects either do not meet or exceed above criteria.
缺陷不符合或出上述要求。
242d
2.4 SOLDER COATINGS AND FUSED TIN LEAD(焊料涂覆层和热熔锡铅层)
2.4.2 Dewetting (cont.)(退润湿(续)
30 IPC-A-600H-201020104
Target Condition - Class 1,2,3(⽬标条件 - 1,2,3级)
No evidence of nodules or burrs.
毛刺象。
Acceptable - Class 1,2,3(可接受条件 - 1,2,3级)
Allowed if minimum finished hole diameter is met.
如能品最小孔的要求,则毛刺允许的。
Nonconforming - Class 1,2,3(不符合条件 - 1,2,3级)
Defects either do not meet or exceed above criteria.
缺陷不符合或出上述要求。
251a
251b
251c
2.5 HOLES – PLATED-THROUGH – GENERAL(镀覆孔 通则)
2.5.1 Nodules/Burrs(结瘤/⽑刺)
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