What is Non Purging Filler Wire & It’s AWS / Industrial Code - TGX series

1. Which Metals Require Purging?

Stainless Steel, Duplex, Super Duplex, Cr-Mo steel, Reactive metals(Ti, Ni, Zr and their alloys)    

                          Unpurged Weld                                Purged Weld

2. Difference between Normal GTAW Process and Non Purging Filler Wire for Stainless Steel Root Pass Welding. 

• Purging in the welding industry is generally understood to mean the removal of air which contains
• Oxygen and some other gases need to be removed to prevent them

from combining with the hot metal produced in welding.

• Oxygen will form oxides which may lead to discoloration, porosity and contaminated
• Hydrogen in the presence of titanium and some steels can cause embrittlement of the weld
• Weld Purging is generally necessary for the first weld run when joining two separate parts. This sealing weld will be called a “root run”.

3. Disadvantage of weld Purge.

• It can be costly and time-consuming to set up and maintain the

purge gas flow and equipment.

• They are invariably single-use solutions.

• It can affect the mechanical properties and corrosion resistance if the purge gas is not pure or

• It can pose a risk of asphyxiation (Suffocation) or fire if the purge

gas leaks or accumulates in confined spaces.

• Air contamination can cause insufficient fusion and penetration along with oxidized reverse surfaces of the root pass bead.

• Inert gas feed connections can be of poor quality and lead to

4. What is Non Purging Filler Wire [TGX]

• TGX Series Non Purging Filler Wire for TIG welding, produce slag to protect the reverse side of the root pass from oxidation by the

• Saving the costs for back shielding gases and gas purging downtime including the setting time for gas purging

5. Bead Appearance of Non Purging Filler Wire

304L Pipe, 7mm thick, 20mm dia. 80A-14V, 100%Ar shielding, 5G

Back side (After slag is removed)

Face side (After slag is removed)

6. AWS / Industrial Code of Non Purging Filler Wire

• KOBELCO developed TGX Non Purging Filler Wire in
• KOBELCO submitted new code registration for TGX to A5 committee in AWS (American Welding Society).
• AWS approved and registered new classifications as “Stainless Steel Flux Cored Rods” in AWS 22 in 1995 

• AWS 22, ASME SEC II Part C SFA-5.22

1. “Specification for Stainless Steel Electrodes for Flux Cored Arc Welding and Stainless-Steel Flux Cored Rods for Gas Tungsten Arc Welding”

7. TGX can be used for All Joints?

8.Chemical & Mechanical Properties

Table 1 Chemical composition (%) and ferrite number of all weld metal

Table 2 mechanical properties of all weld metal per AWSA5.22

Product also meets corrosion test as per ASTM A262 IGC Practice E.

Inspection Certificate

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