Accessories for Oxygen free Welding
Purge baffles for pipes and tubes developed by Walter Schnorrer
These baffles are designed for use in pipes and tubes to contain and distribute the purge gas in the region of the weld root. In welding high alloy steels the environment in the root of the weld typically needs to contain less than 50 ppm of oxygen in order to prevent oxidation. The purge baffles can used alone or in conjunction with an oxygen analyzer to ensure a good welding environment on the back side of the weld.

Related products:
Large pipes and cylinder baffles
Flat surfaces
Flexible fixtures for curved surfaces

Features of tube purge baffles

  • Use for all purge gases in MIG/MAG, TIG and plasma welding processes
  • Reduces purging time saves gas
  • Ensures uniform distribution of the purge gas.
  • Triple seals on each end of the baffle
  • Heat resistant seals to 340 degs C
  • Laminar gas flow from built in diffuser on one end
  • Always stay in line - works for bends, tube ends, flange connections.
  • Units for tube sizes from 13 mm to 215 mm
  purge gas baffle for tubes and pipes  
 
Double Ended Purge Baffles

Principle of Operation
The baffles comprise a pair of seals separated by a rigid or flexible rod. Each seal has three flexible lips to ensure a tight seal to the tube wall. Integrated into one of the sealing lips is a disc shaped gas diffuser which produces a laminar flow of the purge gas into the space between the seals. The air in the space between the seals is displaced by the purge gas and flows out of ventilation holes on the other seal.

 
Specifications and Ordering Information
Each unit comprises sealing disks, flexible coupling and 8 mm gas connection
Tube Sizes Purge Flow Purge time (minutes) length of flexible connections Model Number Price USD
mm inches Add item to shopping cart
13 - 16 0.51 - 0.63 3 L/min 0.5 single spring P17 $160.00
16 - 20 0.63 - 0.79 3 L/min 0.5 single spring P21 $160.00
18 - 23 0.71 - 0.91 3 L/min 0.5 single spring P24 $160.00
23 - 29 0.91 - 1.14 3 L/min 0.5 single spring P30 $185.00
29 - 38 1.14 - 1.5 4 L/min 0.5 single spring P39 $210.00
36 - 43 1.42 - 1.69 5 L/min 1.5 single spring P45 $245.00
42 - 53 1.65 - 2.09 6 L/min 1.5 120 mm P57 $280.00.
45 - 58 1.77 - 2.28 6 L/min 1.5 120 mm P60 $280.00.
55 - 67 2.17 - 2.64 7 L/min 1.5 120 mm P70 $295.00
68 - 80 2.68 - 3.15 8 L/min 1.5 150 mm P82 $320.00
79 - 92 3.11 - 3.62 8 L/min 1.5 150 mm P95 $330.00
98 - 114 3.86 - 4.49 11 L/min 1.5 150 mm P117 $395.00
120 - 136 4.72 - 5.35 13 L/min 1.5 150 mm P145 $435.00
150 - 168 5.91 - 6.61 16 L/min 1.5 150 mm P176 $515.00
190 - 205 7.48 - 8.07 22 L/min 4.0 200 mm P220 $915.00
195 - 215 7.68 - 8.46 23 L/min 4.0 250 mm P231 $955.00
 
Single ended purge baffles
Single ended baffle single end purge dams
Single ended purge tube assemblies
Tubes up to 43 mm diameter can be purged with an open end provided the seam is within a tube diameter of the baffle. The single ended units have a single triple or double seal baffle with a gas diffuser quick connect
Quick connecter has a hose nipple on one side and snap fitting for the purge dam feed tube on the other side.
small tube dams
Left to right
USA Quarter for scale
SE 1700
SE 1703
SE 1706
 
Ordering Information Single Ended purge baffles
Each unit comprises a single tube end purge seal with gas finger and 8 mm gas connection
Tube IDs Nominal Diameter Gas finger length
- 10 mm OD
Model No. Price
USD
shopping cart
mm inches
13 - 16 mm 17 mm 0.67 12 mm SE1700 $55
13 - 16 mm 17 mm 0.67 25 mm SE1701 $60
13 - 16 mm 17 mm 0.67 50 mm SE1702 $63
16 - 20 mm 21 mm 0.83 12 mm SE1703 $60
16 - 20 mm 21 mm 0.83 25 mm SE1704 $65
16 - 20 mm 21 mm 0.83 50 mm SE1705 $68
19 - 23 mm 24 mm 0.94 12 mm SE1706 $63
19 - 23 mm 24 mm 0.94 25 mm SE1707 $68
19 - 23 mm 24 mm 0.94 50 mm SE1708 $71
23 - 29 mm 30 mm 1.18 12 mm SE1709 $75
23 - 29 mm 30 mm 1.18 25 mm SE1710 $80
23 - 29 mm 30 mm 1.18 50 mm SE1711 $83
29 - 38 mm 39 mm 1.54 12 mm SE1712 $75
29 - 38 mm 39 mm 1.54 25 mm SE1713 $80
29 - 38 mm 39 mm 1.54 50 mm SE1714 $83
36 - 43 mm 45 mm 1.77 17.5 x 13 mm SE1715 $120
 
Flange Purger kits
The SC Flange Purger consists of an aluminum cone connected to single ended tube purge baffle. The unit incorporates a gas diffuser producing a laminar flow of gas during purging and welding. The gas flow rate can be estimated to be 10% of the ID of the tube in mm. Typical purging times using the Flange Purger are less than 1.5 minutes.
large flange cone flange adaptor
Ordering Information for the Flange Purger
 
The Flange purger is made up of two elements the cone and the baffle seal. An individual cone will cover a larger range of tube sizes than any single baffle seal so to specifiy your flange purger choose a cone and a baffle from the tables below. Each cone is provided with a kit of connectors to connect the sealers to the cone. These have lengths of 40, 60, 100 and 150 mm ( 1.5 to 6 inches )
Tube size ID range for Cones of the Flange Purger
colors show the range of seals that could be used with each cone
Part No Price USD

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16 - 39 mm FPC16 $135.00
39 - 80 mm FPC34 $145.00
80 - 116 mm FPC80 $190.00
118 - 168 mm FPC118 $230.00
168 - 216 mm FPC168 $280.00
215 - 270 mm FPC215 $375.00
Tube Sizes ID range for baffle seal elements of the Flange Purger Part Number Price USD

Add item to shopping cart

mm inches
13 - 16 mm 0.51 - 0.63 FPS17 $90.00
16 - 20 mm 0.63 - 0.79 FPS21 $90.00
18 - 23 mm 0.71 - 0.91 FPS24 $90.00
23 - 29 mm 0.91 - 1.14 FPS30 $95.00
29 - 38 mm 1.14 - 1.5 FPS39 $95.00
36 - 43 mm 1.42 - 1.69 FPS45 $145.00
42 - 53 mm 1.65 - 2.09 FPS57 $155.00
45 - 58 mm 1.77 - 2.28 FPS60 $160.00
55 - 67 mm 2.17 - 2.64 FPS70 $175.00
68 - 80 mm 2.68 - 3.15 FPS82 $180.00
79 - 92 mm 3.11 - 3.62 FPS95 $190.00
98 - 114 mm 3.86 - 4.49 FPS117 $210.00
120 - 136 mm 4.72 - 5.35 FPS145 $245.00
150 - 168 mm 5.91 - 6.61 FPS176 $255.00
190 - 205 mm 7.48 - 8.07 FPS220 $540.00
195 - 215 mm 7.68 - 8.46 FPS231 $555.00

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