| Best Brazing Practise |
| Silver Soldering Tips |
| Strength of Silver Solder Joints |
| Silver Solder |
| Silver Solder Fluxes |
| Soft Solder Fluxes |
| Flux Cleaning Salts |
| Boiler Fittings/Accessories |
| Cadmium Bearing Silver Solder |
| Cadmium Free Silver Solder & Fluxes Prices incl VAT & Delivery |
| Soft Solders Prices include VAT and delivery |
| Copper Phos Alloys |
| Silver Solders |
| Refrigeration |
| Small Pack Prices - include VAT and delivery |
| Sievert Propane Torches, Burners & Hearths. Prices include VAT & Delivery |
| Joining Aluminium |
| Joining Brass |
| Joining Cast Iron |
| Joining Stainless Steel |
| Joint Cleanliness |
| London Jan 2012 |
| Shepton Mallett 2011 |
| Harrogate May 2012 |
| Guildford Jul 2011 |
| Bristol Aug 2012 |
| Midlands Oct 2012 |
| Sandown 2010 |
| Society Presentations |
| References |
| What the professionals say |
Sievert Propane Torches, Burners & Hearths. Prices include VAT & Delivery
The most common form of heating is to use a gas torch. There are many on the market and it can be difficult to assess the true value of a torch when it comes to brazing using silver solder. Some are excellent at browning custard, skinning tomatoes, or lighting a firelighter but nothing else!
The basic premise is to have a torch that will produce a focused flame capable of generating sufficient heat quickly enough to achieve penetration of the silver solder into the gap to produce a strong leak tight joint. Ideally this is a defined flame that will enable you to control the heat, create the right ''heat pattern'' that will determine where the silver solder flows.
The flame temperature of a torch is not indicative of it's heating capacity. An oxy-acetylene torch burning at 3500°C often has less heating capacity than a propane torch.
An oxy-acetylene torch produces intense heat in a small area. It produces more localised thermal stresses due to local expansion and contraction. It can generate sufficient heat to attain surface temperatures sufficient for silver soldering. The alloy will be seen to melt and flow on the surface (produce a sound joint?) and the flame moves on.
Propane with a ''not so fierce flame'' not only gets the surface hot but generates ''through heat'' necessary for the alloy to penetrate the joint.
Unless great skill is used, it is very easy to overheat the alloy with an oxy-acetylene flame. This can induce centre line cracking or porosity in the alloy leading to weak joints.
Using the wrong part of the flame can also induce embrittlement of copper.
Protracted overheating of a cadmium bearing alloy over an extended period can also lead to health risks.
The average model engineer causes more problems for himself with oxy-acetylene torches than any other heating medium. Available via CuP Alloys Ltd are torches that ensure good performance to meet any application.
Butane Torches
These are refillable torches running on lighter fuel. They have small well defined flames ideal for soft soldering or silver soldering small components. The Pencil Torch has a fixed flame and burns for about 15 minutes.
Propane Torches
The most popular torches are propane torches. Your gas supply is not governed by annual contracts or administration charges. Propane is readily available. The torches can be simply and quickly modified by fitting different burners to achieve different heating needs encountered during brazing. Many torches simply blast out heat but these Sievert torches and nozzles will help you develop heat patterns to achieve and control capillary flow through the joint so creating sounder joints.
Nothing compares to Sievert torches when it comes to range of torches and burners from the Sievert range. Start with the Sievert PMPX kit. It has a variable 1-4 bar regulator, 2m of hose, a 3486 bandle, 3511 neck tube and SV 2941 burner.
Simply connect to a gas bottle and apply a match!
or build up your own system by selecting a regulator, hose, handle, neck tube and burners from the selection below.
Cyclone burners draw in the air further back down the neck tube. This allows the flame to burn in enclosed areas where otherwise the flame would extinguish due to oxygen starvation.
Oxy-Propane Torches
The addition of oxygen to the flame increases the flame temperature and produces a smaller more concentrated heat source.
Insulation Materials
The performance of all torches will be improved by using heat reflecting bricks and/or an insulating blanket to prevent heat being absorbed. Not all bricks are suitable. Some bricks, eg those taken fom storage heaters, actually absorb heat and can act as a "heat sink" slowing the process down.
Vermiculite blocks and plates have a lower thermal mass and so absorb less heat. They can be cut or shaped to suit your individual requirements using simple hand tools.
Insulation blanket, based on clay wool, absorbs even less and reflects even more of the heat. Although 25mm thick, it can be readily cut with scissors.
Prices (which include VAT and delivery) and more details of burner performances etc can be found by clicking on the links below.
| You are viewing results 1 to 14 of 14 |
| You are viewing results 1 to 14 of 14 |
 |
| Subscribe to our newsletter by clicking on the newsletter button above and you'll receive regular emails keeping you up to date on our latest news and special offers |
