product information

 

The KIT

A kit comprises of:

  • techno weld rods
  • a stainless steel brush
  • a stainless steel abrader
  • comprehensive instructions
     
 

what equipment do i need to techno weld?


The basic equipment requirements are:

  • A techno weld kit
  • A heat source

A heat source is anything that can heat the aluminium you are working on to a temperature of 380°C. This has ranged from a charcoal fire to sophisticated induction system. In most cases it will be a gas torch. The best fuel to use is propane, and for professional use we recommend the Primus Sievert "Sievermatic" torch.

The size of burner used depends on how big the Aluminium is with which you are working. Basically a small flame for small job and a big flame for bigger jobs.

Remember - Aluminium is very good at getting rid of heat - so you need to put in heat faster than the Aluminium loses it. It is not the temperature of the flame that is important it is the volume of heat it generates.

Large components like cylinder heads can be preheated in an oven or over a gas ring to get "background" heat into the work piece , and then a standard gas torch

It's also a good idea to have an insulated working surface to put larger workpieces on . Firebrick is ideal.

 

Frequently Asked Questions

How strong is it?
A properly made Techno Weld joint is at least as strong as the parent metal.

What thickness of Aluminium is it possible to repair ?
Any thickness from .0005 " to any size, provided you have the heat source to get the joint area to 380C

What preparation/cleaning is necessary?
Just clean away excessive oil and dirt from the joint/repair area with brush or chemical cleaner and then finally, thoroughly clean the joint/repair area with the Stainless Steel brush.

What alloys work with TECHNO WELD?

  • Cast Aluminium (Cylinder Heads, Blocks, Transmission casings, Brake calipers,etc)
  • Magnesium/Aluminium castings
  • Aluminium Extrusions
  • Duraluminium
  • Birmabrite (Land Rover/Range Rover bodies)
  • Mazak (zinc based alloy) door handles, carburettor bodies, trim etc.
  • Titanium
  • Techno-Weld fusion-welds all of these metals, and will also weld dissimilar types of Aluminium together.

How safe is TECHNO WELD to use?
Techno-Weld is entirely safe to use. There are no noxious materials , gases or substances. There is the remotest chance of a zinc oxide fume if used over an extended period (some hours) in a confined space, at temperature higher than that at which Techno-Weld is used. Like all brazing and welding processes , protective clothing and eye wear should always be used. This is clearly stated in the instructions.

What kind of Joints can you make ?
Any type of joint is possible using Techno Weld

Can you fill holes with TECHNO WELD?
Yes!

Can you build up missing parts with TECHNO WELD?
Yes!

Can TECHNO WELD be Chrome plated?
Yes!

Can TECHNO WELD be used on Anodised Aluminium ?
Yes provided you remove the anodised coating in the repair area.

Can TECHNO WELD be anodised ?
No ( unless the area is nickel plated first)

Step by Step instructions.


hese are the basic simple steps in using Techno Weld. Full instructions, written and illustrated, are included in the TECHNO WELD kit

 
Step 1 - Cleaning

Clean the area to be welded thoroughly with the Stainless Steel Brush, which is supplied in the Techno Weld Kit.

     
 
Step 2 - Heating

Heat the area evenly keeping the flame moving. Start heating back from the area to which you wish to apply the TECHO WELD rod. Move the flame away and touch the TECHNO WELD rod on the surface of the aluminium where you wish to apply the material. As soon as the aluminium is at 380C the rod will melt.

     
 
Step 3 - Coating

Coat the surfaces to be joined with a thin layer of TECHNO WELD , in the same way as you would "tin" a solder joint. The aluminium must be hot enough to allow the TECHNO WELD rod to form a silvery trial.

     
 
Step 4 - Abrading

A thin layer of oxide will have formed between the TECHNO WELD and the surface of the aluminium. This needs to be broken and it is done by drawing the Stainless Steel Abrader through the molten TECHNO WELD.

     
 
Step 5 - Joining

If you are joining aluminium pieces, coat both sections with TECHNO WELD as outlined above, jig them together and just evenly re-heat the aluminium surrounding the coated area until the TECHNO WELD remelts and the components "sweat" together. Draw the stainless steel Abrader, through the molten TECHNO WELD at the joint face to make a neat fillet.

     
 
Step 6 - Cooling

The fusion weld will cool and harden in a few seconds, just let it cool naturally, and as soon as the aluminium has cooled enough for comfortable handling it can be ground, machined, drilled, tapped plated or painted as required.

     
 
Building up

TECHNO WELD can be built up to replace/repair missing parts. Just follow steps 1-4 above, then once step 4 is completed heat the TECHNO WELD rod in the flame until it melts onto the coated aluminium, gently working it in with the Abrader

     
 

TROUBLE - SHOOTING

There is only one major problem - and that is people don't read the instructions!

This leads to one of two problems (and they really are the only two) :

1. People will heat the welding rod in the flame.

This results in the TECHNO-WELD melting onto the Aluminium and doing nothing (other than rolling off!).

Explanation
It is essential that it is the heat from the workpiece that melts the rod. This is the only way you can ensure that the TECHNO-WELD and the Aluminium are at 380°C at the same time
Molecules of Aluminium start to leave the surface at 380°C and TECHNO-WELD "grabs" these molecules to start the process. If TECHNO-WELD is at 380°C before the Aluminium, it has nothing to "grab".

2. The joint cracks or TECHNO-WELD lifts from the edge of a repair

This results in a weak joint that will fail under stress or a repair that will probably "pit" on dressing back.

Explanation
This is caused by the Aluminium cooling too fast. The Aluminium must be heated in a general area around where the repair is to take place. There should be sufficient heat in the Aluminium to keep the TECHNO-WELD molten on the surface for at least 6 seconds. On large section aluminium castings (cylinder heads, crankcases etc.) 15-20 seconds.
This slow cooling allows TECHNO-WELD to form a large ,strong crystalline structure. Fast cooling results in small "granular" structure which is inherently weak.

If the problem occurs - reheat the job ,( not directing the flame onto the Techno-Weld) until the TECHNO-WELD remelts and let the job recool on the time indications given above.

Large Aluminium workpieces should always be preheated with a big "fluffy" flame or in an oven up to 200-250°C (Gas Mark 9!)

 

Techno Weld ltd.

Tel: +44 (0)1993 851028

enquiries@techno-weld.co.uk

     
 

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