OXY FUEL BASICS
What two gases are commonly used for oxy-fuel welding?
Oxygen and acetylene.
What tool is used to mix the oxygen and acetylene before they burn?
The welding torch.
What is the purpose of filler rod in oxy-fuel welding?
To add extra metal to the weld joint.
What should you use to control the size of the weld puddle?
Proper torch movement and heat control.
What is the main purpose of the oxygen in oxy-fuel welding?
Oxygen supports combustion and helps create the high heat needed for welding.
Which flame has excess acetylene?
A carburizing flame.
What must be formed before you begin adding filler rod?
A molten weld puddle.
Why is torch angle important when using filler rod?
It controls where the heat is directed and helps keep the weld puddle under control.
What is the name of a flame with a balanced mixture of oxygen and acetylene?
A neutral flame.
Which flame has excess oxygen?
An oxidizing flame.
Where should the filler rod be introduced into the weld puddle?
At the leading edge of the puddle.
Why should the filler rod and torch be moved smoothly together?
To maintain an even weld puddle and create a consistent weld bead.
What are the three main types of oxy-fuel flames?
Neutral, carburizing, and oxidizing.
What happens to the flame when more oxygen is added to an acetylene flame?
The flame becomes more oxidizing.
Why should you avoid melting the filler rod directly in the torch flame?
The filler rod should melt from the heat of the weld puddle so it properly fuses with the base metal.
What can happen if you hold the torch in one spot for too long?
The metal can overheat, melt too much, or burn through.
hy is a neutral flame commonly used when oxy-fuel welding steel?
It provides the proper amount of heat without adding too much oxygen or acetylene to the weld.
Why can using an oxidizing flame cause problems when welding steel?
The excess oxygen can react with the metal and negatively affect the weld.
What can happen if too much filler rod is added too quickly?
The weld can become too large, uneven, and difficult to control
When using filler rod, why is it important to coordinate the torch, filler rod, and travel speed?
Coordinating all three keeps the puddle under control, provides proper fusion, and produces an even and consistent weld bead.