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Why use lead-free soldering for SMT chip processing

Why use lead-free soldering for SMT chip processing
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? We will introduce the difference between leaded and lead-free soldering.

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How to check and solve QRF630 reflow oven welding temperature is not going up after running a moment

Question：Why won’t the oven QRF630 turn on? measured the temperature with an optocoupler and it showed the same value.
Answer：the temperature is not going up after running a moment.
It is estimated that the three heating pipes in the upper temperature zone are burned, resulting in the temperature not rising

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