Tips how to Welding Stainless Steel

Before you jump right to the end of the weld is important that everyone reading this understands that there are different types of stainless steel and they are all welded together. Actually there are three classes of products which we call stainless steel. There is also a class of compound called Duplex, and is recognized by their metallurgical structure, more precisely by their micro environment. They Ferri, Austenitic, Duplex and Matrensic.

Tip for Welding Austenitic Steel

They are the ones tha tare considered the best for welding. When buying stainless steel you will no doubt they are here called the "300 series", that classification they form the American Iron and Steel Institute. Not all of his 300 series responded well to welding as in the case of 303. He has a tendency to hot cracking which makes it almost not worth the time or energy to weld.

Ferritic Stainless Steel Welding

These materials respond better if you use an arc welding process. Most automobile exhaust system made of ferritic materials. They do not tend toward hot cracking. If there is a limit ferretic in austenitic materials other than it tends to be much easier to weld. Here are some tips on how to weld stainless steel. 

1. You should first clean the parts thoroughly. Using a wire brush to scrub the surface aggressively should do the trick. This is to remove any chromium particles that have built up over time as well as dirt, grease and other contaminants. To take a good weld must be clean.
    
2. Use the lowest possible heat. Stainless steel comes in sheets as thin as it can easily be misleading. Started as cool as possible and increase gradually if necessary will prevent you from completely destroying the material. Use a small explosion from the arc to make the weld. This should be done in 3-4 second intervals, follow this procedure will also help you to keep the pieces in line.
    
3. There is a big difference between using rods and electrodes. For welding stainless steel using stainless rod only. Every person that ends with "-16" is what you want to use with an AC current type welder. If you have a stem that "-15" needed a welder DC current to get a decent weld.

So you see, there are many things to consider when welding stainless steel. This is only a fraction of what you need to know in order to do a really good weld. You can find more online.

Gas Shield in Welding Processes

Application of gas plays a major role in the welding process. While the ability to cut and heat are very dependent on acetylene, various gas is used as a shielding gas for welding. Shielding gas prevents other gases in the atmosphere from reducing the quality of the welding process. Shielding gas also has an impact on some other aspects of the process, including weld torch travel speed and quality of weld deposit in its finished form.

Type of shielding gas used depends on the method of arc weld is performed and the welded material. Protective gas to meet the needs of specific applications, gas is often conceptualized as a special mixture. Some common elements used in this particular combination of gases including oxygen, nitrogen, hydrogen, argon, and carbon dioxide.

Argon
The third most common gas in Earth's atmosphere, argon is heavier than air and has a low level of heat conductivity. This quality allows the argon arc weld to provide solid stability and penetration. Argon is also an inert gas, which allows it to be used without affecting the composition of welded metal.

As a protective gas, argon is used alone for gas metal arc welding (GMAW) and gas tungsten arc welding (GTAW) on nonferrous metals such as aluminum and copper. It is also used in combination with other agents to GMAW and flux-cored arc welding (FCAW) project that involves the joining of steel.

Oxygen
The addition of oxygen in the shielding gas for GMAW project can improve the stability of the arc. It can also increase the fluidity and wetting characteristics of the weld pool by reducing the surface tension. When used in conjunction with carbon dioxide and argon, oxygen can also provide the flexibility to join some type of carbon steel.

Hydrogen
Used mainly in austenitic and duplex stainless steels, hydrogen is known to increase the weld puddle fluidity and surface cleanliness. When added in small quantities for argon, can also provide an excellent bead appearance and weld travel speed increases GTAW project involving austenitic steel as much as 25 percent.

Nitrogen
This gas can increase the weld penetration and arc stability of austenite and duplex stainless steels. In addition, the shielding gas is used as an additive to improve the mechanical properties and resistance to pitting super austenitic stainless steels and super-duplex. Nitrogen also gives good protection to the metal roots when used with a 10 percent hydrogen.

This is just a small overview of some of the benefits of providing shielding gas to the welding process. For more information on what types of protective gas will work best for your particular welding project, try to contact the supplier of specialty gas equipment.

Mig Welding Basics: Mig Wire Installation

You mig welding wire installation is actually very simple. The first step is to make sure you use a mig welding wire is very high quality. Why? You can have so many problems with mig welding wire does not eat, burn again, excess spatter, birds nesting and so forth.

Assuming there are no long spool of wire mig in mig welder. The first think you have to do to physically open the case welding machine or wire feed up.

Then you have to remove a peg or large plastic nut that is attached to the hub or axle will slide into the welding wire. Now open the box mig wire, check that it is the correct wire size you wish to use and the proper type of wire. Also gives a glimpse and check out the rust.

Lift and slide the spool to the axle / hub. Replace the pegs or plastic nut.

Now go to the end of mig welding gun and remove nozzle / shroud. This will either make or screw off depending on the brand blowtorch. At that time, remove the contact tip by unscrewing it with pliers.

Set beside the nozzle and contact tip.

Back to the mig wire, and in between the coils of wire and mig welding torch which attaches to the front of the machine or remote wire feeder you will find the feed roller or rollers drive.

There will be a kind of hook that can be turned open. This action will increase the feed rollers and allows you to feed wire to the coil drive.

Note that the feed rollers there are usually two grooves. The wire needs to sit in one groove. On the side of the feed rollers will hit the mark that shows what size wire to use in which the groove.

Mig welding machine normally comes with two different sized grooves. For example, 0.9mm and 1.2mm is 0.035 "and 0.045".

Make sure that the diameter of mig welding wire suitable sized garden right on the feed rollers. When running a welding wire precision you need to use the correct path for the feed rollers with a diameter sized mig wire correctly.

You can get away with using slightly different sized feed rollers when you run the wire cheapie low quality mig. Why is this? This is because the wire diameter tolerance will go up and down. So the wire will get thicker and thinner all the time that would compensate for the slightly wrong-sized feed rollers.

I do not recommend this to anyone who is serious about making money in a production environment or welding and fabrication business. This will cause many difficulties.

Now you have to be careful and I emphasize carefully find the end of mig wire and hold onto it and do not let go. If you do it will spin, spin, spin, and you will have a big mess of wire mig in all places.

With the end of mig wire feed to the roller driver, you'll have to go through the small feed tube. This helps guide the wire over the feed rollers.

Keep feeding the wire through the coil driver of the past and into the beginning of mig welding gun. Feed it through about a foot or more.

Lowering and locking latches to drive the rollers, and adjust to get back to number one or the lightest possible setting. Then screw / adjust the voltage down a bit.

Furthermore, if you're using gas, turn the bottle to store your expensive welding gas lay you welding gun and cable out straight from the welder and pull the trigger. Wire will slowly eat through the liner and pop out on the tip holder. You can boost the speed of the feed adjuster to get the wire through more quickly.

Now when the wire ends of the tubes appeared to put the contact or contacts again. Put the nozzle back and cut the wire for about half an inch sticking out.

You are almost done now. You change the gas again. Now ideally you want to feed the wire tension mechanism to be as light as possible so as not to damage the form of welding wire. Welding deformation of premature wear will occur on the feed rollers simply because too much power. This will cause irregular wear in the contact tip and the weld wire will have a small bit of material sheared and squeezed it to be down to the ship from the torch, and from time to time causing it to build up internal resistance which will cause more problems on the track welding.