Metal alloy layer must be very thin. In laser soldering, the thickness of metal alloy layer is 0.1mm. In wave soldering and manual soldering, the thickness of intermetallic bonds in excellent soldering joints is more than 0.5μm. As the shear strength of welded joints decreases with the increase of the thickness of metal alloy layer, it is often tried to keep the thickness of metal alloy layer below 1μm, which can be achieved by shortening the welding time as much as possible.
The thickness of the metal alloy eutectic layer depends on the temperature and time of forming the solder joint. Ideally, the soldering should be completed within 220 C in about 2 seconds. Inadequate intermetallic bonds are common in cold solder joints or solder joints that do not rise to an appropriate temperature during assembly, which may lead to the cutting of solder joints. On the contrary, if the metal alloy layer is too thick and the solder joints are soldered too long, the tensile strength of the solder joints will be very weak.
Welcome to use Smt Assembly service of our company,we are an expert in this field for more than 14 years.
Our Company is UL,ISO9001,ROHS and GJB9001B certified.
Packing and Shipping:
1. How to Get a quotation?
For PCBs,pls send us the Gerber File.For PCBA,pls send us the Gerber file and BOM(Bill of Materials)
2. What is the MOQ?
No MOQ.1 pcs is ok.
3.What is the lead time?
For PCB orders,the lead time is 2 to 10 days.For PCBA orders,the lead time will be 15 to 30 days.
4.Will the boards be tested before shippment?
Yes,all PCBs will be tested by Flying Probe or E-test.For PCBA,we will have AOI,X-ray,and functional test