{"id":2014,"date":"2022-10-11T14:10:00","date_gmt":"2022-10-11T06:10:00","guid":{"rendered":"https:\/\/www.qhsmt.com\/?p=2014"},"modified":"2022-11-01T14:25:32","modified_gmt":"2022-11-01T06:25:32","slug":"smt-pick-and-place-machine-why-use-lead-free-soldering-for-smt-chip-processing","status":"publish","type":"post","link":"https:\/\/www.qhsmt.com\/zh\/2022\/10\/11\/smt-pick-and-place-machine-why-use-lead-free-soldering-for-smt-chip-processing\/","title":{"rendered":"Why use lead-free soldering for SMT chip processing"},"content":{"rendered":"

When customers inquire about SMT chip processing, they often ask whether you are using lead-free soldering or leaded soldering. We will tell customers that both lead-free and leaded soldering are available, and the prices are different. What is the difference between leaded soldering and why should lead-free soldering be used for SMT chip processing? When you use a precise smt pick and place machine to complete the placement, but you don’t get a satisfactory product after soldering? The quality of welding directly affects the final quality of the product.We will introduce the difference between leaded and lead-free soldering.<\/p>\n\n\n\n

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First, the difference between leaded and lead-free soldering is generally said:<\/p>\n\n\n\n

Lead-free solder paste or lead-free solder paste welding, lead-free solder paste is environmentally friendly, leaded solder paste is not environmentally friendly, so the difference between lead and lead-free SMT chip processing is environmental protection and non-environmental protection<\/p>\n\n\n\n

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Second, the difference between lead and lead-free<\/p>\n\n\n\n

a. Different alloy compositions:<\/p>\n\n\n\n

The composition of tin and lead commonly used in lead processing is 63\/37<\/p>\n\n\n\n

The composition of lead-free alloy is SAC305,<\/p>\n\n\n\n

Namely Sn: 96.5%, Ag: 3% and Cu: 0.5%.<\/p>\n\n\n\n

Lead-free processes cannot be absolutely lead-free, but only contain very low levels of lead<\/p>\n\n\n\n

b. Different melting points:<\/p>\n\n\n\n

The melting point of lead and tin is 180\u00b0-185\u00b0, and the working temperature is about 240\u00b0-250\u00b0.<\/p>\n\n\n\n

The melting point of lead-free tin is 210\u00b0-235\u00b0, and the working temperature is 245\u00b0-280\u00b0.<\/p>\n\n\n\n

c. Cost difference:<\/p>\n\n\n\n

Tin is more expensive than lead, and when the equally important solder is changed to tin, the cost of the solder also increases. Therefore, the cost of lead-free processing is much higher than the cost of leaded processing.<\/p>\n\n\n\n

Lead-free processing costs 2.7 times the cost of leaded processing for wave and hand soldering, and about 1.5 times the cost of reflow soldering paste.<\/p>\n\n\n\n

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Why use lead-free soldering for SMT chip processing?<\/p>\n\n\n\n

Now is the time to sum up this issue. Lead-free soldering is mainly about environmental protection. It is healthier for users who use the product and has a much lower impact on the environment. However, the cost of lead-free soldering will be higher, so the unit price of SMD processing will also be higher. Will be high, customers need to use lead-free or lead welding, need to be considered according to the use environment of the product, product price and profit, rather than blindly pursuing lead-free welding.<\/p>\n\n\n