This document discusses gas pressure welding, an oxy-fuel welding process that joins materials together under pressure without filler metal. There are two types of gas pressure welding: low pressure gas welding and high pressure gas welding. The process involves heating the joining surfaces with an oxyacetylene torch to around 1200-1300 degrees Celsius, applying pressure to join the atoms while heating, then allowing the materials to solidify under continued pressure.

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;
I. Low pressure Gas Welding (LPGW)
I. High pressure Gas Welding (HPGW)

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.

6.  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 The torch is withdrawn once the interfaces begins to melt.

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

8. Heating Welding by pressing

10.  There are two basic types of gas pressure welding.
Gas pressure welding
Open square Closed square

11.  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.

12.  In this type, there is no gap between the two components
when heating.
 For that a ring shaped burner is used.

13.  Portability
 Versatility
 Economical for simple and low-quality work
 Very thin plates can not welded
 Lower strength

14. End