When employing a reflow soldering machine, the real key technical parameter would be the temperature curve value of the reflow soldering oven. Only if the temperature curve on the reflow soldering oven is modified can qualified digital products be soldered. But in terms of the temperature profile of the reflow oven, absolutely everyone even now stays set up, wondering????

smt reflow oven

The way to see the temperature curve in the reflow oven

The performing theory on the temperature zone of your reflow oven is that when the PCB board is assembled with a steel mesh or double-track conveyor belt, with the scorching and chilly strokes of each and every temperature segment with the reflow oven (one example is, a sizable machine with 8 heat and 2 cold, that has a whole size of 5-6m Direct reflow furnace), in order to realize the purpose of solder paste melting and cooling and therapeutic to be solder joints, the most crucial temperature alterations may be divided into four parts:

one. The preliminary preheating section on the reflow oven refers to the to start with two sections of the furnace, setting up from place temperature to reach the saddle head of 110-120?? (as an example, the temperature zone of 1-2 of the 10-stage device).

two. The temperature-rising (continual temperature) endothermic part of your reflow oven refers to the gradually increasing and relatively flat saddle a part of the reflow oven curve (such as, to the 3-6 portion on the 10-stage reflow oven, some time is 60-90 seconds.), the saddle The tail temperature is 150-170??. It can be hoped which the inner and exterior temperature on the circuit board and elements might be equalized, and the reason of eradicating the solvent and steering clear of tin splashing.

three. The peak temperature and strong incredibly hot part on the reflow oven (the melting zone of the reflow oven) can rapidly increase the PCB surface area temperature (3??C/sec) to among 235-245??C to obtain the purpose of solder paste welding; This section should really choose no more than twenty seconds (as an example, two sections 7-8 of the 10-section reflow oven).

four. Immediately after the rapid cooling segment of the reflow oven, the temperature is swiftly lowered (3-5??/sec) to make sure that the reflow solder joints can promptly solidify to sort solder joints, that may decrease the area roughness and micro-cracks in the solder joints, as well as the aging strength may also be Greater (as an example, 9-10 phases of the 10-stage reflow oven).

When utilizing the temperature curve tester, you ought to take note of the subsequent points:

one) When measuring, you should make use of a flooring that's been completely assembled. First, review the thermal traits of the printed board factors. Owing towards the distinct heating performance in the printed board, the size on the factors and the variation in resources, the particular heating and temperature increase of each and every issue are distinctive, discover the best and coldest points, and established the thermoelectricity independently. Even the highest temperature and lowest temperature may be measured.

2) Setup as many thermocouple test factors as you can to fully reflect the accurate heating standing of each part of the printed board. For instance, the center and edge of the printed board are heated in another way, the warmth ability of large-volume parts is different from that of smaller parts, plus the heat-sensitive parts need to be established to check points.

3) The thermocouple probe contains a little shape and should be preset at the test placement with specified high-temperature solder or adhesive, normally it's going to be loosened by heat and deviate from your predetermined take a look at position, creating take a look at faults.

Actually, if the temperature curve of your reflow soldering furnace plus the temperature curve tester are utilized, you can find at the moment large, medium and modest reflow soldering styles about the market place. The easy kinds have a few temperature zones to eight temperature zones, plus the big ones have six temperature zones. The sixteenth temperature zone. The much larger the reflow soldering temperature zone, the higher the soldering effect. This depends within the customer's product specifications.

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