Will the tin dipping furnace catch fire if it is always on?

Are dissolved by electric heating. As for the fire you said, you should pay attention. Put one or two fire extinguishers next to the solder. Flux won't catch fire unless it falls under the tin furnace.

Mainly depends on the temperature of tin and welding products.

There are lead and tin materials: 63/37, and the general temperature is 265-275 degrees. Of course, there are also customers whose tin is not good, and those with 285-320 degrees are also in use. The higher the tin temperature, the damage to the product is still there, which can reduce the tin dipping time!

Lead-free tin: Generally, the temperature of tin and copper can be 275-285℃, depending on the product. Products with large heat capacity or products operated by jigs can be properly heated to meet the welding requirements. The main products can be welded by automatic submerged arc welding machine, and can be welded by automatic submerged arc welding machine if conditions permit. Because the temperature control ability and accuracy of ordinary tin furnace are not good, the effect is not satisfactory, so the key of welding equipment is to choose a good flux, which can also reduce the welding temperature!

Good equipment can reduce the temperature of tin and ensure its good welding effect!

1 Purpose of welding procedure specification:

Effectively control the welding process, make it technologically advanced, economical, reasonable, safe and applicable, and ensure the quality.

2, production equipment, raw materials:

Solder oven, clamp, scraper, circuit board with components inserted, flux, tin bar, diagonal pliers.

Step 3 Prepare for work

Open the soldering furnace, set the temperature to 240-265 degrees (high in winter and low in summer), and when the temperature is stable (add appropriate tin bars if necessary).

4, operation method:

(1), clamp the circuit board with the right hand, visually check whether each component meets the requirements, and correct it with the left hand if it does not meet the requirements.

(2) Clamp the inserted circuit board with a clamp, spray a little flux on the copper surface, and scrape off the oxide layer on the tin surface of the tin furnace with a scraper.

(3) Immerse the copper surface of the circuit board sprayed with flux at an oblique angle of 15. When the circuit board is in contact with the tin liquid, slowly push the circuit board forward to make it perpendicular to the liquid level. The circuit board is immersed in 0.5mm or so, and the tin immersion time is 2-5 seconds (depending on the pin thickness of components, the thicker the pin, the longer the time and the shorter the time).

(4) After tin dipping, lift it slowly and gently at an oblique angle of15, keep it steady, and do not shake it, so as to prevent virtual welding and fullness.

(5) When it is basically cured after 5 seconds, observe whether the circuit board is inclined and deformed, and put it into the next process after passing the test.

(6) After using the operating equipment, turn off the power.

5, manual solder joint

The following points are derived from the welding mechanism and proved to be universally applicable by practical experience.

(1), master the heating time.

When welding, we can use different heating rates, such as the shape of the welding head is not good, and when welding large weldments with a small soldering iron, we need to extend the time to meet the requirements of solder temperature.

In most cases, extending the heating time is harmful to the assembly of electronic products, because:

A, the bonding layer of solder joint exceeds the appropriate thickness due to long-term heating, which leads to the deterioration of solder joint performance.

B, printed boards, plastics and other materials will be deformed and deteriorated if heated too much.

C. after heating, the performance of components changes or even fails.

D, solder joint surface due to flux volatilization, loss of protection and oxidation.

Conclusion: The shorter the time, the better, on the premise of ensuring solder wetting the weldment.

(2), keep the appropriate temperature:

If we use high-temperature soldering iron to weld solder joints in order to shorten the heating time, it will bring another problem: the flux in solder wire does not have enough time.

Welding surface overflow and premature volatilization failure; The fast melting speed of solder affects the function of flux; Because the temperature is too high, although the heating time is short, it also causes overheating.

Conclusion: In order to keep the welding head in a reasonable temperature range, the general experience is that the welding head temperature is 50℃ higher than the melting temperature of solder.

The ideal state is to shorten the heating time at a lower temperature. Although this is contradictory, we can get a satisfactory solution through operation in practice.

(3) It is harmful to apply force to the solder joint with the welding head.

The welding head mainly transfers heat to the solder joint by increasing the contact area, and it is futile to apply force to the solder joint with a soldering iron.

In many cases, it will cause damage to the welded parts. For example, the welding points of potentiometers, switches and connectors are often fixed on plastic components, and the result of force is easy to cause the original failure.