Nowadays, with the rapid development of society, there are many solder paste manufacturers. When facing these manufacturers to promote one's own products,SMTHow do people usually choose to purchase? Because inSMTDuring the production process, every processing step is quite important, and inSMTHere, everyone hopes to purchase relatively inexpensive solder paste, which can reduce production costs. However, in this case, even if the price is low, everyone should be aware that there are times when the quality is not good. After all, you get what you pay for. Now, JJY solder Paste Manufacturer will explain the requirements to you:

1Alloy composition

Under normal circumstances, chooseSn63/Pb37The alloy components of the solder can meet the welding requirements;For silverAgOr palladiumPdFor the welding of coated devices, the alloy composition is generally selected asSn62/Pb36/Ag2The solder paste;For welding of components that are not resistant to thermal shock, the selection includesBiWelding powder.

2The viscosity of solder paste

inSMTIn the workflow, there is a process of moving, placing or transporting from printing (or dispensing) the solder paste and attaching the components to sending it into the reflow soldering heating processPCBThe process;During this process, in order to ensure that the printed (or dot) solder paste does not deform and has been pastedPCBThe components on the solder paste do not shift, so it is required that the solder paste isPCBBefore entering the reflow soldering heating, it should have good adhesion and retention time.

A,High-viscosity solder paste has the characteristics of good pile-forming effect of solder joints and is more suitable for fine-pitch printing;Low-viscosity solder paste has the characteristics of fast falling, no need for tool washing and time-saving during printing;

BAnother characteristic of the viscosity of solder paste is that it changes with the stirring of the solder paste, and its viscosity will decrease during stirring;When stirring is stopped and left to stand for a while, its viscosity will return to its original state;This point plays an extremely important role in how to choose solder paste of different viscosities.

CFor the viscosity index of solder paste (i.e., viscosity), the commonly used one isPa•SIt is expressed in units;Among them200-600Pa•SThe solder paste is more suitable for use in needle-type dispensing systems or production process equipment with a higher degree of automation;The printing process requires a relatively high viscosity of solder paste, so the viscosity of solder paste used in the printing process is generally at600-1200Pa•SLeft and right, suitable for manual or mechanical printing.

Many manufacturers are making purchasesSolder pasteWhen choosing products, everyone hopes to find a reliable manufacturer with good quality. So they will compare some manufacturers and like to look at the ranking list and the price options. For such choices by customers, it is understandable.