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Questions tagged [hot-air]

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3
votes
2answers
83 views

Is hot air only meant for desoldering?

The question is simple. I only ever seem to find a soldering-related hot air gun on a machine dubbed a “rework station” and the only reference I can find to using hot air to solder SMD components is ...
1
vote
2answers
143 views

How do i solder qfn package using soldering iron?

I don't have any soldering station but I need to solder the qfn package chip so how I solder it using a normal soldering iron.
1
vote
2answers
108 views

LGA parts and hot air soldering

Does the solder pattern on these huge pads indicate what might be going on ? The parts would not work about 80% - 90% of the time. I am trying to follow the ramp_up-soak-reflow-ramp_down curve to ...
1
vote
2answers
66 views

band / cylinder style heating element wattage calculations

The question concerns band or cylinder heating elements, which are designed to clamp around a hollow cylinder and heat whatever is flowing through it. I'm looking for information on how to calculate ...
1
vote
1answer
2k views

Hot air soldering without destroying ICs

I have designed a circuit board that has about 20 parts on it, including a surface mount LMV431 Adjustable Zener Shunt Regulator and MMBT2907 PNP transistor. It appears that every time I solder up a ...
1
vote
1answer
256 views

Is this chip 0.5mm pin pitch?

Am I correct in thinking that this chip has 0.5mm pin pitch? I don't know where to look for it on the details of the chip! When I google for '144-LQFP' I found a link which suggests it is 0.5mm pitch ...
0
votes
2answers
316 views

Small 'blistering' under surface-mount soldering attempt - is this a problem?

I am very new to SMT soldering - and have started with a small project. I used resin flux, followed by a small amount of solder paste and then a hot air gun at around 373 degress celcius to flow the ...
1
vote
1answer
123 views

Safe to use bigger heater element?

So here's the run down, I purchased a rework/soldering iron station off eBay years ago. Believe it's a cheap Chinese knock off labeled CE 852D+ Recently the heater element for soldering iron went bad....
1
vote
2answers
4k views

Hot air rework temperature to avoid solder melt on opposite end

When removing/replacing chips. Is it safer to use little to no air flow but higher temp heat or lower heat with more airflow? My hot air station is a model 852d+ with a max temp setting of 500c and ...
2
votes
1answer
704 views

Are “ionizing” hair dryers any different from the regular ones? [closed]

I've been shopping for hair dryers and in all malls I've been to the salespeople explained how the "ionizing" hair dryers are better than the ones without that function, because it makes your hair ...
4
votes
2answers
2k views

Is it safe to use hot air on SMD LEDs?

I usually use hot air gun to solder components on the PCB. However I am afraid of using hot air on SMD LED - they have that clear plastic on top and i am afraid of melting it with hot air, so I ...
0
votes
0answers
127 views

BGA Underfill Problem

The problem is that when I heat an underfill chip to reflow it, the solder tends to boil and come out of the sides causing shorts and other problems. Does anyone know how to prevent that and why it ...
2
votes
1answer
881 views

Solder through-hole or surface-mount components first?

I am new to surface mount soldering. On a board with both SMT and through-hole parts (header pins), which parts should I solder on first? I imagine the technique I use for SMT soldering is important....
5
votes
2answers
468 views

Potential pitfalls/caveats for developing a stencil for solder reflow

I'm developing a project that requires ICs that are in a QFN package, some have a slug on the bottom of the IC. Since these are QFNs, I'm not interested in hand soldering these; so I'm leaning toward ...
4
votes
1answer
1k views

SMD Removal Process

I'm practicing my SMD soldering skills and done my research on how to remove SMD devices from a PCB motherboard and brought a T8280 PREHEATING STATION and 852D SMD station. I understand you have to ...
0
votes
2answers
176 views

Is airbath + air gun reflow appropriate for low-volume commercial production?

I understand there are a number of ways of reflowing individual SMT boards. I've seen small temperature profile ovens, hotplates, skillets, airbaths, and hot air guns used. I'm trying to determine ...
7
votes
4answers
970 views

What is a good lab surface to hot-air rework on?

I have been scouring the internet for information regarding what would be a good surface to do hot air rework on. Right now, my lab, if you want to call it that, is a wooden bench with cardboard ...
2
votes
4answers
11k views

Need recommendation for a first hot air station

I have a pretty nice soldering station, but now that I am finding the need to work with non-DIP type packages unpreventable, I am beginning to think that purchasing a hot air station would be a good ...
4
votes
1answer
892 views

A good technique for removing 50-pin SMD CF/MD card slot with Hot air

I have a piece of equipment that has a CF/MD card on it. Somebody tried to force the card in and broke 2 pins off. I managed to replace the two pins temporarily, but it was kind of a hack job, but it ...
10
votes
5answers
13k views

Hot Air Gun for Reflowing a Board?

I'm curious how well a hot air gun would work for reflowing an entire board. My circuit board has about 250 components (including 0402 passives, and a couple of 0.5mm pitch TQFPs) and it's a bit of a ...
24
votes
5answers
88k views

Safe temperature for desoldering SMD components w/ hot-air rework gun?

What is a reasonably safe temperature to use for desoldering SMD components using a hot-air rework gun? I have a new-to-me rework station from Xytronic and the documentation clearly assumes you know ...
5
votes
1answer
3k views

Hot air lead-free BGA reflow

I'm experimenting with trying to reflow a 0.8mm BGA myself for prototypes/repairs. I've solved the main problem: alignment. I've used my 3D printer to print custom board guides that align on large ...
0
votes
4answers
373 views

Rework station recommendations?

We're looking for a decent hot air SMD rework station to help us fix up our prototypes. In the past, I've used one of the low-end Aoyue models, and found it lacking (the interface had problems, and ...