I suspect there is a deviation in the draw nozzle chip time, and then when welding vacuum leak, resulting in a tin material is attracted...

怀疑吸嘴在吸取芯片的时候存在偏差，然后在焊接的时候真空漏气，最终导致了锡料被吸到芯片表面。

youdao

Recycling waste tin material: lead-free solder recovery and recycling, tin tin slag the recycling, tin line recovery, solder paste recycling waste tin tin ash, such as waste lead recovery.

回收废锡料：无铅焊锡回收、锡渣回收、锡条回收、锡线回收、锡膏回收、锡灰等废锡废铅回收。

youdao

Shaped into pellets convenient for shipping, copper and tin ingots were the raw material for making the metal which defines the Bronze Age.

铜和锡锭是制作金属的原材料，它们被磨成小球型可以便于运输，而那个时代也因金属而得名。

youdao

The idea is to coat the tin material onto the copper component that conducts electricity.

FORBES: Tin: The Secret To Improving Lithium-Ion Battery Life

They run on Thorium, a mildly radioactive material more common than tin and found all over the world.

FORBES: UK Parliament Group to Study Thorium Reactors

It passed a resolution telling buyers of tin not to source their raw material from mines controlled by Congolese militia leaders.

ECONOMIST: Failed states