So, you have noticed the little holes in your finished product and that’s why you are here to know how to get rid of pinholes in welding. Don’t worry! It’s easy to get rid of those pesky holes. But what exactly are these little holes and what cause them? To get rid of something, it would only be understandable that you know about what causes them. so that you can prevent them from coming back. First we are going to be defining some terms:
- Welding – “to weld”; This is a process of fabricating or sculpturing that aims to join two materials together, which are most of the time metals or thermoplastic products, with the use of fusion.
Anther meaning would be “to join pieces of metal together by heating the edges until they begin to melt and then press them together.”Welding is a permanent process. The materials you have joined together will stay together unless some external force forces them apart.
- Welder – this refers to a person whose job is to weld materials together; one that welds
- Pinhole – “is a very small hole that is made by a pin or in some other way”; “a welding defect that has been cause by high welding temperatures. If the temperature is too high, tiny holes that resemble a pinhole, that can be seen in fabrics, can be seen.”
Thank you to Google and Merriam-Websters for the word meanings. As you have read, pinholes are considered to be a “weld defect” because they aren’t supposed to be there but they are. Sadly, you cannot prevent pinholes because they will be happening in one way or another. What you can do would to reduce them and them erase them from your finished product.
Here are some of the cause of Pinholes:
1.) You better check you gas solenoid at the wire feeder or in the GTAW machine if it’s defective or not. This could be a possible contributor to pinholes.
2.) You should also check the GMAW gun liners if they are contaminated or not, because if they are, they might introduce elements that you do not want to you weld pool. Stainless steel and high-nickel-alloy are some of the elements that are susceptible to attracting these contaminants.
3.) Check your welding gas because it could be contaminated as well. You will need to call the gas supplier so they can thoroughly check your gas supply. You can also check because maybe it’s already out of gas, that’s why there’s a lot of pinholes appearing.
4.) Check if there is moisture. This could be just water or morning dew, but it could also come from the process of condensation because of welding on a heavy plate and lap joints. This may occur when the temperature is below fifty degrees Fahrenheit. To combat this, you will have to preheat the metal up to 200 to 220 degrees Fahrenheit to be able to evaporate the moisture. You can wipe it to but just to be super sure, you can just heat it up.
5.) There’s some kind of air or draft that disturbs the shielding gas delivery during the welding. Fans near you or even fans as far as 25 feet away can have an effect on the gas delivery. Keep note of open doors or windows.
6.) If the metal you are welding has a paint, grease, oil, glue, or sweat release large volumes of gas during welding and they are exposed to arc welding temperatures.
So those are some of the causes of pinholes, now, how will you get rid of them?
Here’s one solution: CLEAN the metal on both sides. Make sure that the air flow in your shop is only about 25 CFM and that there’s no breeze, fans, etc. Ventilation is important but it doesn’t have to disturb the gas distribution.
Another solution would be to just cover the holes since they are already there, right? If you failed to prevent them, then you just have to go do the next best thing which is to cover them and make them disappear. To do this, you will need to buy an epoxy from a hardware store or at Amazon if you are lazy and you just want it delivered to you. Epoxy has two meanings but in this situation, the meaning: “to glue, fill, or coat with epoxy resin.” is the one applicable. Here is an example of an epoxy:
J-B Weld 8267-S SteelStik Steel Reinforced Epoxy Putty Stick -2 oz
You can buy this for only 6.00 US DOLLARS! That’s quite cheap right? It is able to repair anything that is made out of metal. Feel free to use it on wet or dry surfaces. You can even use it confidently in places that are completely submerged in water, or even in gasoline. You can drill it, fill, tap, machine, or paint it. This product can be mold or used to patch things, for this situation, we will use this product to patch the pinholes. After apply, the product will be set in approximately 5 minutes, but you can’t touch or modify the area first. Give it at least an hour or so before you drill, tap, or whatever else you have to do. This will ensure that the product has done it’s job. The product can withstand high temperatures so don’t worry, it will not melt away.
Here’s a review about it:
Like 45 billion other people, I saw the Mighty Putty commercial on TV and thought it sounded great. My husband sighed and said, that’s been around forever, and a lot cheaper, too.
So I looked around and lo and behold, J-B Weld IS “Mighty Putty,” minus the horrific shipping and ‘processing’ fee.
I bought this at a local hardware store to test it out (around $3 if you can get find it; my husband suggest an auto parts store.) It does work like the commercial says. I wanted to put up a towel rack in a guest bathroom without drilling through the tile.
Well, it worked. Set up in a few minutes. Next day you could hang Billy Mays from it, and I don’t think it’d break.
I’d highly recommend the J-B brand, unless you’ve got a lotta spare cash and you want to make sure Billy Mays retires in style! — Katy Lake
So now that you know how to get rid of the pinholes in welding, you can confidently show your finished products to the world without any defects. Don’t forget to subscribe to us! Leave us a comment! And share this article with your friends and family.