# Welding Force: Get a Closer Look

• GZunich
In summary, the pressure applied to the weld comes from the airflow through the valve, which is controlled by air flow. This equation would not work for a transient solution, where the valve is closed and the pressure is instantly applied.
GZunich
Homework Statement
There is a flapper valve that is a 4.5mm disc welded to a body with a 3.5mm opening. They are attached with a spot weld approximately 0.5x0.5mm. There is a maximum flow through the opening of 0.20684N/mm2. What is the maximum force seen on the spot weld?
Relevant Equations
M=wl^2/2

Perhaps you could attempt a solution first? What do you think the best approach is for this problem?

I’m having trouble trying to figure out how to start. The pressure applied to the weld comes from the air flowing through the valve. It’s controlled by air flow, but does that come from the pressure?

I know this for will apply a force to the valve but the force applied to the weld will be controlled by the properties of the material. I don’t know what equation will take the material properties into account.

If the flapper is less than 100% open pushing against the stops, you know how much lifting force there is. Can you start from that?

I’ve gotten here: total area of contact with the airflow times the pressure gives you the total force applied to the valve. But from there is where I get confused because of how flexible the material is.

Yes, as I read the problem it is incomplete without the description of the flapper material. I assume the problem is asking about the steady state where the flapper is held open at some position. For example there would be nearly zero force on a flapper made of tissue paper, it would just open completely. Hardened steel 2cm thick would hardly move at all and would take the full force from the pressure given. I suppose my answer would be somewhere between 0 and 2N.
If they want the transient solution, where the valve is closed and by some miracle the pressure is instantly applied, then it will see the full force as it starts to accelerate to open.

If the young’s modulus E was known, would there be an equation to fit the maximum force seen at the weld?

Can anyone help? I’m still stuck on this real world problem

## 1. What is welding force?

Welding force refers to the amount of pressure or force applied during the welding process to fuse two pieces of metal together.

## 2. How does welding force affect the quality of a weld?

The amount of welding force used can greatly impact the quality of a weld. Too much force can cause distortion or burn-through, while too little force can result in a weak or incomplete weld.

## 3. What are some common types of welding force?

Some common types of welding force include compression, shear, and tension. Compression force is used to push two pieces of metal together, shear force is used to slide one piece of metal against another, and tension force is used to pull two pieces of metal apart.

## 4. How is welding force measured?

Welding force is typically measured in pounds or kilograms using a force gauge or load cell. These tools can accurately measure the amount of force being applied during the welding process.

## 5. Can welding force be adjusted?

Yes, welding force can be adjusted depending on the type of welding being performed, the materials being welded, and the desired outcome. It is important to carefully calibrate and adjust the welding force to ensure a strong and high-quality weld.

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