CWS Model "O" Lead Welding Torch
The Model O torch is the original British designed product that was intended for lead welding. Designed to fit nicely in the hand and adjust with the thumb means you need a quality bit of kit to ensure you get a reliable and quality lead weld.
Please click the video tab to watch a video of our torch.
Some Model O torches in the market are poor copies even to the extent of being dangerous. This is not the case with the CWS Lead Welding torch, at Noz-Alls our Model "O" is fully stripped down on arrival with various parts being modified making our Model "O" just as unique as the Everest Original.
After assembly each lead welding torch is then tested by ourselves in Cheltenham to make sure that they operate as well, if not better than the original.
To hlep prove the point we have added pictures of the parts stripped down, some have been machined, some are yet to be machined which is followed by ultrasonic cleaning as well as mechanical cleaning, before being assembled and tested.
We fit all new "O" rings and discard the old ones.
This work is put into the torch so the torch functions correctly at the very low flows required resulting in a stable flame.
Each Model O lead welding torch is spray coated with a PTFE coating offering resistance against oils and other chemicals. Not only does this make it look smart but means you can keep it cleaner for longer, plus the red and blue coating also identifies the inlet gas connections and valve positions.
On the topic of keeping your Model "O" torch looking good, each torch is supplied in a plastic flip top box in which to keep your torch safe when not in use. In the box you will find a comprehensive information sheet to help ensure you are able to get your setup absolutely right for the code of lead you will be welding. When you buy the CWS Model "O" torch, you are buying the proper job, no half measures.
Please see the link at the bottom of the description for information on settings and setup procedure.
Every blowpipe is tested to ensure it conforms with and meets BS EN ISO 5172 as well as being tested for performance and flame stability.
See our video of the generally available cheap variants of the model "O" and how easily and annoyingly the flame setting varies just by touching the control knob!
Noz-Alls
What you get:
CWS Model "O" Lead Welding Torch
Model "O" Tips - Sizes A1, A2, A3, A4 & A5
Oxy Fuel Equipment Setup Instructions
Lead Welding Chart & Gas Pressures Chart
(Note - Picture 5 is the old version of our Model O to help identify which version you have when you need a new neck et cetera).
Spare necks are available including a 90 degree neck which is a fairly common mod made by many lead welders plus there is a straight neck, not used very often but artisans order this for the really awkward joints.
Please see the related products section for these necks.
To complement the Model "O" torch at Noz-Alls we also have super flexible 3mm bore hoses which are suitable for use with this blowpipe and are about as good as you can get as to having "nothing attached" to the end of the torch (weight and mobility wise).
You no longer have to fight with 6,3mm hoses!
Link to Noz-Alls information sheet:-
Lead Welding Advice Sheet
Lead Welding and the myth of the “ball” flame
Noz-Alls being a gas equipment specialist company and with the author being a nozzle design engineer I feel the need to let the wider lead welding community understand the “ball” flame expression and the Myth behind it with respect to lead welding.
The need for explanation has come about due to the number of our lead welding customers who telephone us and announce that they cannot set a “ball” shaped flame? When asked why they want to set a ball shaped flame they explain that there is a lead welding expert on U-Tube who carries out really good lead welding and in the video he expresses that you need to set the correct “ball” flame.
Firstly – a ball flame would be and is completely wrong – if the flame is a ball then there is a problem with the nozzle. On a small orifice of a welding nozzle the flame will always be a cone shaped, albeit a very small cone to a long pointed cone this being true for all lead welding tip sizes 1 to 5.
I watched the video in questions several time to be sure of what I was understanding. There are a few safety issues and procedures which are incorrect in the video so make sure when you operate that you follow the correct lighting up and closing down procedure.
The artisan is completely correct that setting the correct flame is essential to the success of the lead welding, when the artisan is explaining what you need to do, he hesitates, as he says, “ you must set the………ball flame correctly”. The issue is that the artisan does not know the term used for the inner flame cone or primary cone. As the artisan sets the flame, he terms the inner cone as a “ball” rather than a cone, I believe that this is where the confusion of setting a “ball” flame stems from.
Secondly - The lead welding cone is generally very small for Model “O” sizes #1A, #2A & #3A or the #1P, #2P or #3P when viewed through a shade #5 lens you will see that the cone is triangular in shape – almost an equilateral triangle – unlike the larger sizes which appear more conventional in shape with a longer sided cone with a rounded tip.
Lead welding technique demands “dipping” of the nozzle in and out of the lead to give the instant melt and puddle, lead can stick to the tip face, this can cause the flame cone to be mis-shaped and difficult to weld with – do not prod the orifice. Warm up and wipe away the lead.
With the correct Noz-Alls Model “O” lead welding tip it is possible to use oxy / propane because the nozzles have been designed flow the appropriate amount of gas, whilst providing a stable flame even in a wind, the flame cone does not blow off.
Oxy / propane cannot be used for fusion welding of steel, stainless steel, aluminium or copper this is due to the oxidising nature of the flame.
Any questions concerning lead welding or our lead welding Model “O” blowpipe, which has secure stainless steel valve spindles, which don’t adjust the flame setting when you tap them or work with the torch, please give Noz-Alls a call on 01242 681052.
Gas Pressures & Nozzle Sizes
Operating the Model "O" nozzles at the correct gas pressures is vital and will make it easier to weld. Each nozzle size is important and will be used for different lead weights / code of lead, altering the angle of your weld may dictate using a larger or smaller nozzle size - please see the guide. When you require more heat it is important to use a larger nozzle rather than trying to force a smaller size - the welding cone will be wrong and will make it more difficult to weld, conversely when you require less heat switch to a smaller nozzle - one nozzle size does not work across all lead codes nor for welding in all directions - Check the table, use the correct nozzle and make your lead welding more professional.
At the torch inlet the nozzles generally only require 2 or 3 PSIG or 0.15 bar gas pressure for both the fuel and the oxygen, which is only just off the "zero pin" on the working pressure gauge, using too high a pressure will result in too forceful a flame and make flame control more difficult.
Model “O” nozzles are very small (apart from #5 for Heritage Lead Code) so the pressure required is very low.
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