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How to Gas Weld Mild Steel – A Complete Guide

How to Gas Weld Mild Steel

Gas welding is a great skill to have, especially if you’re looking to carry out your own metalwork or fabrication projects. It’s a fairly straightforward process and can be used to weld mild steel, stainless steel, aluminum, and copper alloys. In this blog post, we’ll look at the basics of gas welding mild steel and how you can get started with this welding technique.

Before You Start Welding

Before you begin your project, make sure that you have all the right tools and equipment. Most importantly, you’ll need a gas welding torch (also known as an oxygen-acetylene torch). This consists of two tanks – one containing pure oxygen and the other acetylene gas. The tank valves should be opened slowly until the pressure gauges reach their recommended settings before the hoses are attached. Make sure that you also have a good pair of fire-resistant gloves and safety glasses, as well as appropriate clothing – such as long pants and sleeves – to protect yourself from sparks while welding.

Welding Process

Once you have everything set up, it’s time to start welding! Begin by heating the area around where you plan on making your weld until it turns red hot. This is when you apply the filler rod by pushing it into the joint with your torch’s tip at an angle of about 45 degrees away from the surface being welded. At this point, keep your flame moving in circles over the joint while continuously adding more filler rods until it melts into place. When finished, let the molten metal cool for about 10 seconds before separating them from each other – otherwise known as striking an arc – which will create a stronger bond between both pieces of metal when cooled down properly.


Gas welding is a great way to join two pieces of metal together without having to rely on external heat sources like an electric arc welder or even solder! With just a few simple steps outlined above, anyone can learn how to do basic gas welding using mild steel in no time at all. Once you get comfortable with this technique, feel free to explore different metals like aluminum or copper alloys for more complex projects! All it takes is some practice and patience—you’ll be an expert gas welder in no time!

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