Question 1: The role of pads The basic components of a printed circuit board include pads, vias, solder resist layers, and text printing parts. The solder mask is the yellow or red or black or green or other colors you see, and some circuit boards are yellow solder masks. The role of solder mask is to prevent the parts that should not be soldered from being connected by solder, and reflow soldering is realized through solder mask. The whole surface of the board is subjected to boiling tin water, and the part of the circuit board without solder mask is soldered, while the part with solder mask is not soldered.

(In addition, it can improve the insulation, anti-oxidation and beauty of the line. )

Question 2: The role of welding tabs of sheet metal parts Most of the parts processed are parts processed by machine tools, and the processing methods include turning, milling, planing, drilling and grinding. Sheet metal parts are mostly thin metal parts, and the processing methods include cutting, stamping, stamping and bending. Welded parts refer to the processing methods of welded parts, such as argon arc welding, electric welding and oxygen welding. I'm not familiar with castings and forgings.

Question 3: What's the difference between covered electrode, welding wire and weldment? Covered electrode is used for manual arc welding, with coating and coating protection; Welding wire is used for argon arc welding, shielded welding, submerged arc welding, etc. Gas protection or other forms of protection; The welding lug is made of silver, copper, zinc, cadmium and other metals, and rolled into a thin sheet of about 20 wires. It is used to weld various small metals such as band saw blades and marble saw blades, and has the characteristics of high welding regularity and strength.

Question 4: Introduction of Silver Solder Sheet Silver Solder Sheet is made of silver, copper, zinc, cadmium and other metals and rolled into about 20 sheets. It is used for welding various small metals such as band saw blades and marble saw blades, and has the characteristics of high welding uniformity and high strength.

Question 5: The advantages of silver solder are 1, low welding cost of silver solder, 2, small oxidation area during welding, 3, beautiful appearance after welding, 4, low power saving and energy saving cost, 5, multiple workpieces can be welded at one time, which improves welding efficiency, 6, small oxidation area, 7, uniform heating, no shortage of welding and silver covered electrode, 8, beautiful and firm workpieces after welding. 10 has high efficiency and convenient welding. For copper-aluminum flux-cored wire, as long as the silver welding piece is placed between the cutter head and the substrate and heated evenly, there will be no missing welding and welding spots.

Question 6: What does the welding lug in the second line of the picture mean? Is it used for welding? Or a conductive sheet for connection? Soldering tabs are copper sheets welded on the circuit board.

Question 7: What is a silver solder joint? It is made of silver, copper, zinc, cadmium and other metals, and rolled into a thin sheet of about 20 threads. It is used for welding various small metals such as band saw blades and marble saw blades, and has the characteristics of high welding uniformity and high strength.

Question 8: How to connect weldments? 5 points for special pliers. If the quantity is small, it can be shaped with needle-nosed pliers after welding, and there are many machines for processing.

Question 9: How many ingredients are used to make gold solder bumps? K-gold welding tabs are generally made of gold, copper, silver, zinc and other metals. Pay attention to the gold color of the welding lug and the color of the jewelry to be welded, otherwise it is not good.

Sorry for the late answer!

Question 10: What does solder film mean? It depends on the welding. Can see through