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PCB Assembly Introduction

Wednesday, December 27, 2017 11:05:59 AM Asia/Shanghai

RayMing is one company you need for full-scale high-quality PCB assembly services. We're proficient in one-stop electronic manufacturing involving PCB fabrication, components sourcing and PCBA. Some of the benefits of calling us for your PCB assembly service include:

pcb assembly

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Posted in Company News By RayMing Technology

China Complete Turnkey PCB Assembly service

Tuesday, April 19, 2016 11:01:13 PM Asia/Shanghai

There are many demanding deliberations based on the plan for the level of production volumes and type of production in the PCB assembly project. To make sure that no criteria are overlooked and missed upon, we scrutinize and analyze all the aspects of your PCB projects. Our flexibility to use human resource and machines with moderate technologies proves our reliability to load the project at the right time and economy.

We have adopted flexibility to provide prototyping services with full or partial turnkey assembly wherein the components and all the inputs needed in the PCB manufacturing as per the specifications in the BOM and Gerber File are being arranged by us fully or partially.

Our core focus is to give optimal cost effective inventory management services with a dynamic approach to utilization of manpower and machine as it is totally dependent on the low or high run production with accurate results. Our global outlay has made it possible to adopt an effective procurement process of the components used in the PCB production to toss around the ease and difficulty in obtaining those components.

We specialize in high mix, low to medium volume manufacturing of Printed Circuit Board Assemblies,Welcome to send your design and bom list to  sales@raypcb.com 

Posted in SMT News By RayMing Technology

With their turnkey PCB assembly solutions, RayMing Technology assures industrial clients to deliver PCB prototypes in a timely manner and at a reduced cost.

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Posted in Industry News By RayMing Technology

How To Choose Types of Solder to Use For SMT Assembly?

Friday, March 25, 2016 2:00:28 PM Asia/Shanghai

Because it seems to be so many types of solder out there, choosing which solder to purchase can be confusing.

When I started out in electronics I had no clue, so I just used whatever solder I could find. But did you know that solder is not only used for soldering electronics?

Actually, solder is also used for plumbing.

And the solder used for plumbing should definitely not be used for electronics as it contains acid!



By Ilja at de.wikipedia [GFDL or CC-BY-SA-3.0], from Wikimedia Commons

 

The main solder types

There are just a few basic points you need to know to understand what solder to choose and what to stay away from.

First of all, solder comes in many forms: pellets, bars, paste and wire. As a hobbyist, you will only need to get acquainted with the solder wire. And maybe the solder paste if you want to do SMD soldering.

There are two main types of solder:

  • Lead-based solder
  • Lead-free solder

The main practical difference between the two is the melting temperature. So in essence, you can choose whichever you like. Read more about soldering tools here.

Lead-based solder

Solder based on lead was universally used in the past. It was made of a mixture of tin and lead. Usually a 60/40 (tin/lead) mix, that melts at around 180-190C degrees.

Because lead has some damaging effects to our health, the industry is moving away from lead and towards lead-free solder.

Lead-free solder

Lead-free solder is solder without lead. EU requires commercially available electronics to use lead-free solder (RHoS) because of the health hazards of lead.

It has a higher melting point, so it is a bit harder to work with, but usually not a problem.

The flux core of solder wires



Solder wires usually have a core inside the wire containing flux. Flux is designed to improve electrical contact and mechanical strength in solder joints.

There are mainly two types of flux cores. Acid core and rosin core. Acid core is used for plumbing and rosin core is used for electronics. So use rosin core.

(Side note: A new water-soluble flux core is starting to gain some traction as an alternative to rosin core because it is more environmental friendly.)

Summary

The main types of solder are lead and lead-free. You can use both for electronics, but it can be easier to work with lead-based solder.

Make sure to stay away from acid core solder as this is intended for plumbing, NOT electronics.

Solder can be bought from RayPCB.com . 

Posted in SMT News By RayMing Technology

Rework Options In SMT Manufacturing

Wednesday, March 23, 2016 10:33:46 AM Asia/Shanghai

Circuit boards manufactured with Surface Mounting Technologies have revolutionized electronics manufacturing, thanks to their ease of construction and the much higher component density they make possible.  SMT construction allows for devices which are smaller, more feature-packed, and (very often) cheaper to produce.

SMT manufacturing does introduce new challenges, especially when it comes to repairs and other rework. Because SMT boards can utilize components that are only a fraction of a square millimeter in area, traditional soldering techniques often cannot be used to rework them.  A single dollop of solder could bury entire components!

When your SMT-created products need rework, there are two basic options if soldering can't fix it.  Both have their advantages and disadvantages, and it's good to know which technique(s) your own manufacturing shop is using.

New SMT Manufacturing Techniques Demand New Rework Techniques

The key to reworking with SMT products is the use of non-contact methods, to avoid causing additional damage to the board.  Usually, these are combined with either computer controls or precise microscopes to guarantee accuracy.

I.  Infrared

Infrared rework systems are generally the easier to install and use, as they are based around a "gun" firing long- or short-pulse blasts of IR energy to heat up the soldering around components.  They can be nearly as precise as a laser beam, IR is also very quick to heat up the solder, so infrared rework systems allow for faster repairs.

However, IR systems also suffer from some drawbacks.  Because the beam is so precise, this can lead to uneven heating of a surface.  Changes in albedo (light vs dark surfaces) between components can also cause uneven heating.  Also, on denser boards, there's enough radiant heat that shielding may be needed to protect nearby components and their solder.

Infrared is generally the more cost-efficient option, when it's feasible.

II.  Hot Gas

The other option in SMT manufacturing rework is the use of hot gasses, usually either standard air or nitrogen.   With hot gas, the overall temperature can be precisely controlled. The gas also creates a much more even heat distribution, as well as generally simulating conditions within the reflow ovens which finish SMT circuit boards.  In other words, they use the exact form of heating the solder and boards were built for.   

More advanced hot gas rework systems can even include a cooling chamber, again, to recreate the original conditions under which the circuit board was created.  This allows even reworked boards to adhere to very precise manufacturing standards.

There are no real downsides to hot gas in terms of effects on the board, but such systems are somewhat more expensive to operate.  They require the use of compressed gas, which can cause safety concerns as well.  Such techniques are also generally a bit slower than IR, although the time for rework will vary substantially based on the individual properties of the board being repaired.

Rework Options Add Value To SMT Manufacturing

Whether it's for correcting inevitable defects coming off the assembly line, or adding full product repairs to your list of post-sale services, SMT rework techniques can substantially increase the value and ROI for your manufacturing investment.

Posted in Industry News By RayMing Technology

What's RayMing's PCB Assembly Services

Saturday, March 12, 2016 11:12:55 PM Asia/Shanghai

PCB Assembly Services

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Posted in Company News By RayMing Technology
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