There are many cases when we need to produce goods made from materials of different properties and thicknesses.
Speaking in the electric and electronic industries rubric about different lamps manufacturing (28 and 34), we touched up on solutions to two problems:
- in order to obtain vacuum and durable connection of ferrum-nickel alloy
with tungsten - in the impulse pump lamp - welding-brazing was applied by using a heat
of main arc (30 A), burning in pulse mode (durations of pulses and pauses
were 0,16 sec and 0,24 sec) when overlap of welded spots makes up to 75% due to
the welding speed of nearly 11 mp/h. The process was like surfacing of ferrum-nickel
alloy which moistened (wetted) the surface of tungsten, and the diffusion
layer between materials was no more than 0,1 mm (for such purposes the AMC-1 welder would be very suitable),
however, cheap, safe and simple sets may be
also applied with usage of their non-transferred arc
- joining of molybdenum sheets as well as of tungsten wire cathode with molybdenum support - in generator lamps - has been also made by welding-brazing through platinum. Metallographic research showed that molybdenum and tungsten have diffused in platinum, and the joint had very high quility (as we suggest, both types of our equipment may be suitable for such lamps).
Bellows and membrane structure especially with wall thicknesses 0,025-0,25 mm are usually connected to other structures with the use of armature thickness of which may be 1-5 mm or even more.
The AMC-1 welder is the most suitable for such purposes as well as for direct welding of the above mentioned membrane structures.
Some examples of various materials and different thicknesses connections have been shown on our sitewww.pogrebis-temp.com/materials.html, www.pogrebis-temp.com/technologies.html and www.pogrebis-temp.com/unique.html. Generally speaking, we had dealt with carbon, special and stainless steels, ferrum-nickel alloys, nimonics, chrome-nickel-cobalt, composite and copper alloys, gold, palladium-silver and platinum alloys and some their combinations, including, for example, high-alloy steels + low carbon steels, palladium alloys + nickel or nickels alloys and (or) stainless steels (austenitic and ferritic), palladium + platinum alloys, etc. Of course, our equipment allows for possibilities to weld all these materials and, morever, in some cases - to produce microbrazing (rarely brazing) and welding-brazing of some of them. It may be used also for titanium alloys welding.
Here, based on the Table 13 from (46), we wish to name some other materials combinations which our equipment would be able to weld too:
- invar (1,2 mm) + chrome-nickel steel (1,2 mm)
- phosphorous bronze (0,5 mm) + brass (0,3 mm)
- inconnel (0,5 mm) + chrome-nickel steel (0,5 mm)
- chrome-nickel steel (0,25 mm) + ferrous rolled stock (0,25 mm)
- molybdenum (0,5 mm) + platinum (0,5 mm)
- copper (0,3 mm) + brass (0,2 mm).
We are positive that other materials combinations as well as their thicknesses variations are possible to perform with the use of our new welding equipment and technology. At the same time their users have more possibilities of dissimilar welds obtaining and, due to combined welding-brazing processes usage, much more variations of the produced joint structure – because of many alterations of the heat concentration in the working zone, while applying the main and non-transferred arc - with various their powers and alignments.
