It is vital for you to know welder types for your particular job before buying a RF Welder. What you buy really depends on what it is you are going to do with it.
Types of welding
There are several types of welders to choose from and it all depends on what type of welding you do as to which one you choose.
Oxyacetylene Welding -- this is a torch and it burns a mix of oxygen and acetylene gas. The heat gets to 6,300 degrees Fahrenheit in most torches like this. You can use this to solder, weld or braze. Sometimes these are used to cut some types of steel. This is generally the first type of welding a student will do and the first welder they will use.
Arc Welding (SMAW) -- this type of welder works with an electrode called a "stick" and it creates an arc with the welding material. It works by putting the stick inside the machine, the stick melts and it produces material as filler in the weld. And this welder is a bit difficult to control for the beginner.
Mig Welding (Wire feed / GMAW) -- this system also uses an electrode that is fed in a wire, pushed through a gun and it makes a weld puddle. They use either a shielding gas or a wire cored with flux. It is easy for people to use this kind of welder for home projects and they are easily found at hardware stores.
Tig Welding (GTAW) -- this type of welding also uses an electrode but it is used with a shielded gas (inert) which makes a weld puddle. It uses a welding rod also that makes a weld bead when a rod is stuck in the arc. This makes good welds and is a higher level of welder.
If you are new to welding your would better find a welder easy for use, such as a stick or a wire feed welder. A wire welder sometimes is easier because you will use a continuous feed into your gun as you continue to weld. In a stick welder, you'll need to change the electrode or "stick" periodically as it runs out. Also, the wire welder will be easier to use, give you better welds from the beginning and you can learn it relatively quicker than stick welding.
The next thing you will have to decide is the type of welding you will do most of the time. When you are going to be doing welding for small repairs, you probably will want to get an MIG welder because it is very versatile in the types of materials it can weld. If you are going to use it in your garage at home or the same location, the MIG welder will be perfect. It is not very portable because you have to also use a container of shielding gas with it. If you are going to do a lot of outside welding, then you will probably want to use the flux cored wired welding. Since flux is already in your machine, you won't need a shielding gas and this makes it more portable. The only problem is that with this type of welder, you can only weld one type of steel.
Another idea is to go online and check out the many welding forums and ask about the various welders. You can read archives and ask specific questions about your needs, and receive guidance from other welders.
If you buy your welder through an industrial products manufacture you may find a welder that does both.
Lastly, talk to experts to find out what they believe is the best welder. Ask an experienced welder for further guidance or tips. Talking to experience welders about welding reduces the chances of you getting into a problem with choosing the right welder.
When you buy your welder it is also important to make sure you purchase the safety equipment need. For some you will need a full safety helmet and for others you will need at least safety goggles. However, you can be exposed to fumes, arcs that go haywire, electric shock and other hazards so you will want to make sure High Frequency Welding Machine that you have what you need.