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Ipc-Whma-A-620d Standard – Learning The Subjects Covered

by codegrape / May 10, 2022

The IPC-whma-a-620d will always prescribe practices and requirements for manufacturing wire, cable, and harness assemblies. The standard will describe methods, materials, tests, and the acceptability criteria for producing mechanically secured, crimped, and soldered interconnections. It will focus on the related assembly activities too, which are secured with harness and cable assemblies. 

Any kind of method that produces assembly conforming to acceptability needs described in the IPC-whma-a-620d standard can be used over here. This standard sets some expectations between the members of WHMA and their customers for the acceptable quality workmanship for harnesses and cables. 

The agreement value that it comes with:

The proper use of the IPC-whma-a-620d standard will need agreement on the Class to which the product belongs. The user will have the main responsibility to identify the class where the assembly is likely to be evaluated. 

  • In case the user fails to establish and document the chosen acceptance class, then the manufacturer might be able to do so.
  • It is always a vital piece of the procedure, inspections, and materials, which are standard for the cable and even for the wire harness industry.

The product class and classifications:

There are multiple electronic product classifications over here to follow. Understanding those points beforehand will serve the purpose really well for you.

You have the Class 1 or the General standard first:

  • It will include the products which are made suitable for applications where the main need is the function of the completed assembly. 
  • It will be the daily consumer appliances the most.

Then Class 2 is the Dedicated Service:

  • It will include the products that are in need of continued performance and extended life. For such practices, uninterrupted service is the main goal but not that critical. 
  • Typically speaking, the end-use environment over here won’t cause failures. Some examples are home computing, telephones, game systems, TV, and more.

Class 3 is the high performance or the harsh environment one:

  • This section is going to include the products where the continued performance or the performance on demand seems to be the most critical point of action.
  • Here, the equipment downtime will not be tolerated, and then you have an end-use environment that can turn out to be uncommonly harsh.
  • Here, the tools or the equipment needs to function whenever asked for, like the life support systems and some other critical systems.
  • Some of the major examples under this stage are military, medical devices, and any product in need of a high-performance routine.

The Revision D standard to follow:

The IPC-whma-a-620d Revision D is here to provide the entire electronics industry with updated criteria for the acceptance and performance of cable and wire harness assemblies. This revision will always include synergy with the IPC A 610 and also the IPC J STD 001. These practices are going to align most of the requirements, which are now common with the IPC-whma-a-620d category over here.

  • It is also true to state that Revision D has more than 700 full-color pictures alongside some major illustrations, all under one umbrella.
  • There are 19 major chapters included where the criteria are based on safety wires and prep, need for individual wire seals, soldering terminals, crimping of stamped and formed contacts, working of machined contacts, and more.
  • Then you have other chapters dealing with insulation displacement connectors, splicing, ultrasonic welding, connectors, marking, molding, raceways, coax or biax cables, grommets, and more.
  • Some chapters will talk about the shielding, assembly, over-molding of that flexible flat ribbon, and even the wire-wrap terminations.
  • Overall, there are 420 pages allotted with this book, and it was released in January 2020. 

Table of contents:

Apart from the basic Scope, Purpose, Classification, and Measurement units and applications, IPC-whma-a-620d will further cover the definition of requirements under its belt. The topics covered under this platform will be:

  • Inspection conditions and acceptable
  • Defect and disposition
  • Process indicator and combined conditions
  • Conditions not specified
  • Uncommon or the specialized designs
  • Material and the process non-conformance

Apart from that, the book also talks about Process Control under Statistical Process Control. Then you have Order of Precedence under Clause References and Appendices. Through this book, you will learn about some major terms and definitions, such as:

  • Engineering documentation
  • Wire diameter
  • User
  • Supplier
  • Process control
  • Objective evidence
  • Manufacturer
  • Inspection
  • FOD or Foreign Object Debris

So, next time you are willing to learn more about the IPC-whma-a-620d, it is mandatory to check in with the best subject matters right away. The more you research and get engrossed, the better results are going to come your way for sure. So, get along with the subjects well and thoroughly now.

cableharness assembliesipc-whma-a-620dmaterialproductstandardtestwire
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