Microsoldering components not sticking

Same as I do, when it's cold I join forces, heatgun in one hand and iron in the other.

Hi Chris

Your advice for more heat is greatly appreciated and I will try it again

I did try 500deg c and even THAT didn’t work Witch really had me thinking, is it just a bad reel of components?,the reason for me thinking this is it’s the second time this has happened ,I started with one bad component and tried to apply my new one and no luck ,so I tried another part of the board and I got no luck ,so I tried a different component all together (a fuse previously it was a cap I was trying so it’s a different reel)and it went on with no problems

I am aware that this sort of thing is uncommon to the point of nearly unheard of but I can get my head round it as I have done microsoldering before on all sorts of devices and never ever had this problem!

I was told by some people here try a lower temp according to what the components listing said so il try that as well

thanks again for all the help it’s means a lot!:-)

@hellomacos - More heat is not more temp! Its making sure the board is at a high enough temp so the area you are working on is at temp.

Think of a sheet of copper heating one corner only requires heating the corner area, but the rest of the sheet of copper will wick the heat away quite quickly so you need to hold the heat to the area long enough so the area stays warm (just below the flow temp of solder) so when you focus the heat to do the soldering task the soldering the joint doesn't fail!

We call this pre-heating. Depending on the size and shape of the logic board the area might not need too long to warm or it may need more as there is a lot of copper which is wicking the heat away.

Once the board is at temp using an iron to tin the pad if its bare. Frankly, I just use some solder-wick to flatten the joint to place the small SMD just using flux paste to hold it in place adding fresh solder either using hot air or an iron. Again the component size and what the area has that I need to worry about and the amount of copper which will suck the heat away.

@danj

Thanks I will try the temp at 375deg c and a higher more heat and plenary for flux

Thanks again for the advice:-)

@hellomacos I don't see a lot of flux residue on your solder pads. Looks like a blob of solder is stuck to the pad. More heat, more flux should help with this. You must tin the solder pads properly, tin your soldering tip.