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Extruder screw barrel welding repair method?

Update:16 Nov 2018
Summary:

Maintenance method one In the oxyacetylene welding proc […]

Maintenance method one
In the oxyacetylene welding process, a violent flame is generated by igniting a controlled mixture of oxygen and acetylene gas. The gases are discharged from the respective gas sources through a pressure regulator. It is introduced into a flare and then discharged from the tip and ignited. The flame intensity is dependent on the flow rate of the gas, the gas mixing ratio, the characteristics of the selected fuel gas, and the type of tip used. The weld pool formed by the contact of the flame, the workpiece and the welding rod forms a weld.
Oxyacetylene welding requires high skill to obtain high quality deposits, a process that is slow. The advantage of oxyacetylene welding is that it provides a base material dilution that is not laser-based. A layer of deposit is usually sufficient to achieve the desired hardness.
Maintenance method 2
TIG welding is the most common method used in the manufacture and repair of extruder screws. Partial intense heat of the TIG causes dilution of certain base materials, so it is necessary to use a second layer to achieve the full hardness of the hardfacing material.
Maintenance method three
The structure of the PTA torch has an electrode centered around it and is surrounded by a double wall tube that transports metal powder. Hydrogen circulates around the weld zone through this annular flow path to provide a protective hood around the argon arc zone, while metering the metal powder through the holes in the inner wall of the pipe.
Extruder screw repair method four
1 In the MIG welding process, an arc is established between the workpiece and the wire electrode, and the electrode is continuously conveyed by the entire wire feeder through the torch. The arc is continuously melted to form a weld pool, and a suitable gas or mixture of gases covers the weld zone to avoid atmospheric pollution.
2 MIG process has the advantages of high precipitation rate and excellent welding quality, but it can produce more basic material dilution than other processes. Therefore, it is necessary to use a second layer of welding to achieve the desired hardness.