Pressure gas welding process

One of the welding processes that used in Engineering field is the pressure gas welding. There are several types of welding processes similar to this, but pressure gas welding has its unique features.
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1. Pressure Gas Welding (PGW)

2. This is an oxy-fuel welding process producing a weld simultaneously over the entire faying surfaces with the application of pressure and without filler metal. There are two types of pressure gas welding according to the pressure level of gas which is used to weld. They are; Low pressure Gas Welding (LPGW) High pressure Gas Welding (HPGW) Introduction

3. Comparison

4. Heat each reinforce bar at cross section by acetylene and oxygen mixture gas at about 1200 -1300 degrees and put pressure, then join each bar firmly. Bars are steel, hence welding stick each reinforce bar by their join of crystal. Then use heat to make re-arrangement of each atom easily at each reinforce bar joining. Both atom start to move actively by heating at once and also change structure of crystal as before then diffuse. What is PGW?

5. The process starts by heating the interface of two components using a gas welding torch. The torch is withdrawn once the interfaces begins to melt. Pressure gas welding process

6. A force is applied to pressing both components together and maintained until the interfaces solidifies.

7. Heating Welding by pressing

8. Video Clip

9. There are two basic types of gas pressure welding. Continued…

10. In this type, there is a gap between the two components in the heating process. The torch is inserted between the open gap and the interfaces are heated. Open square gas pressure welding

11. In this type, there is no gap between the two components when heating. For that a ring shaped burner is used. Closed square gas pressure welding

12. Portability Versatility Economical for simple and low-quality work Advantages Limitations Very thin plates can not welded Lower strength

13. End