WO2009000278A1

WO2009000278A1 - Soldering with silver ring from the inside

Info

Publication number: WO2009000278A1
Application number: PCT/DZ2008/000006
Authority: WO
Inventors: Abderrahim Bouchafa
Original assignee: Abderrahim Bouchafa
Priority date: 2007-06-25
Filing date: 2008-06-25
Publication date: 2008-12-31

Abstract

The subject of the title relates to the silver ring; it provides an assembly even from the inside of the parts; it ensures the mandatory penetration demanded in the sector of washroom plumbing, central heating, gas and in all the fields relating to this activity. The main issues of the development of this technique of assembly by strong soldering: training capable professional brazers with qualifications that will allow them to assimilate the magnitude of the danger of methane gas and its influence in society, and what must form a motivation that pushes them to carry out a job to perfection knowing that the silver ring method proves the appearance of the uniform liquefied solder over the whole contour of the visible joint.

Description

BRAZING WITH SILVER RING FROM THE INTERIOR Technical field to which the invention relates

The present invention relates to the silver ring, which represents a new method of brazing a 6%, 30%, 40% or 100% silver filler metal or all the silver percentages, even from the inside. parts to assemble, it provides the required penetration required in the sector of sanitary plumbing, central heating, gas and in all areas related to this activity using copper metal parts and copper pipe to assemble. Under the effect of heat it melts the filler metal that fills the gap between the two walls of the parts to be brazed by capillary whose melting temperature is lower than that of the base metal (copper tube , interlock).

State of the art

To make a solder according to the conventional method it is required to comply with the following steps: Tube cutting, mechanical stripping of surfaces with emery cloth, elimination of residues, assembly and positioning, heating of the brazing part, laying of the silver rod on the outline of the joint of the socket and the realization of the solder see figure n ° 1). Difficulties during brazing: The solder does not wet the surfaces, it forms droplets and does not penetrate (see figure n ° 2).

The filler metal wets, but does not penetrate in all the depth of the joint for that it is necessary to heat longer or at high temperature, to modify the initial clearance, to introduce flux in the joint, to clean the surfaces of the joint and to reinject flux in the case of decomposition due to too high a temperature.

The filler metal melts but keeps its initial shape and does not flow so it is necessary to garnish more abundantly of flows and deoxidize the joint surfaces. The filler metal flows out of the joint instead of penetrating.

Brazing: Brazing is an assembly of pieces by covering, as for brazing by capillarity, the parts to be brazed can be of different nature as (copper and brass, copper and steel) one calls heterogeneous brazing, or of the same nature as (brass and brass, copper and copper) is called homogenous solder

Solder defects: Lack of penetration

This is a serious defect that can not be repaired, a professional brazier can be authorized to braze the gas pipes if it holds a certificate of aptitude by the qualigaz service, this defect does not guarantee any mechanical resistance to static and alternate forces, a Fatigue and vibration additionally the brazer has no way to check the penetration of the filler metal (silver) unless it cuts the workpiece after soldering. The investigation of the defects of the brined joints and the evolution of their importance is carried out in two different stages, in order to decide whether to accept or repair the soldered amines.

β Δ the occasion of verification on specimen, vertical section of parts or X-ray inspection, of the correct choice of the soldering process.

• During regular inspections and tests.

In conclusion this brazing method does not guarantee the perfect penetration necessary, does not guarantee the adequate degree of the mechanical strength of the solder and includes αes risks of accident such as gas leaks.

Purpose of the invention

The object of this invention is to eliminate all the difficulties during soldering and all the defects of brazing and the main purpose is to ensure a perfect, total and safe penetration and union in all surfaces between the two walls of the parts, (tube and socket) and that with visual evidence. It is possible to ensure the perfection of the penetration during brazing, as it guarantees a very great mechanical resistance to static and alternate forces, fatigue and vibrations.

At the moment when the brazer can not confirm the penetration with visual evidence in the conventional method, it is now possible for it to do so. (Confirm with visual evidence during soldering) thanks to the method of the silver ring (filler metal), the brazing of the interior of the pieces to be assembled and the phenomenon of Capillarity achieved. The essential purpose of this invention is also to realize savings on:

During brazing: heating time, flux (liquid stripper) and silver solder (filler metal) and copper on large diameters. After brazing (operation phase): the high mechanical resistance to forces and vibrations will eliminate maintenance, repair and site intervention costs since this soldering method will eliminate any risk due to leaks. By realizing this invention, a uniform and aesthetic piece is obtained.

Object of the invention

The object of the invention is, among other things, to overcome the disadvantages. Since the previous method does not guarantee penetration.

Presentation of the essence (the substance) of the invention

The components of this invention are very simple and the means devoted to its realization are: Silver ring (filler metal), flux (liquid stripper), emeri cloth, the choice of a butane gas bottle heating method, and a torch of an enveloping flame burner (half-moon) (see figure n ° 3) and indeed works with the plume and not with the stinger as in autogenous welding, special fork (knife) and cut tube.

During brazing the concentration of the brazer will be based on a single element it is the heating process instead of two element heating and the silver rod. The silver ring (filler metal) and the brazing of the interior of the pieces, the very essence of the present invention, represent the new essential elements in the application of the new brazing method which guarantees the realization of the phenomenon. capillarity.

Description of the new method

To concretize this invention, the following steps must be followed:

Preparation of the ring: According to the different diameters of the pieces to be soldered, according to the table below, the cut of the silver rod is carried out beforehand to a length equal to the diameter of the socket (see figures n ° 4 & 5) afterwards, the piece is surrounded by the cut silver rod on a tube of diameter less than that of the piece to be brazed (socket) to obtain an open circle (see figures n ° 6 & 7).

From the introduction of the silver circle in the bottom of the socket, it closes automatically in the form of a ring (see figure 8). Wand diameter 1.5 mm 30% silver Wand diameter 02 mm 40% silver

Observation: uses the silver rings of diameter of 03 mm up to 04 mm on the diameters 30/32 - 38/40 - 40/42 -

Cutting of the tubes must be carried out with the tube cutter, scrape the end of the beveled socket (see figure n ° 9), mechanical etching of the surfaces to braze with emeri cloth, elimination of the residues, suitably install the ring in silver (filler metal) at the bottom of the socket until it stops, inject the flux into all the surfaces of the socket (the choice of a stripping flux in special liquid for silver brazing) (see figure No. 10), assemble the parts to be brazed properly respecting the clearance of the seal so that the tube reaches the ring until it stops (see figure n ° 11), keeps the parts in position during soldering Preheating the top tube of the seal before starting the armor (Figure 12), heating at the joint of the socket until the ideal temperature to melt the filler metal (850c °) As a result, we can clearly see from sight, the ascent or the re descent and the appearance of the homogeneous liquefied metal over the entire contour of the joint, Thanks to the silver ring inside the bottom of one socket, the phenomenon of capillarity is obtained in all the positions of the joint (horizontal , vertical, inclined, the seal at the top or bottom) (seefiguresl3 & 14). Comparison table of advantages and disadvantages

Claims

1- Brazing technique of copper metal parts with copper tubes, or copper tube with copper tube. 2-Technique according to claim 1, the brazing with silver ring; can be carried out with all the percentages of silver (filler metal) even at 100% silver, and different diameters of the interlockings 06-08-10-12-14-16-18-20-22-24-26- 28-30-32-34- 36-38-40-42-44-46-48-50.

3- Technique according to claims 1 and 2, characterized in that the solder is made from the inside at the bottom of the interlockings outwardly at the joint.

4- Technique according to claims 1, 2 and 3, is characterized in that the heating process is supplied by bottle of butane gas, or oxygen-acetylene and a torch of a burner flame enveloping (half-moon) in preferably, especially on large diameters, and indeed works with the plume.

5-technique according to claims 1, 2, 3 and 4 is characterized in that the concentration of the brazor is based on a single element, which is the method of heating only.

6-Technique according to claims 1,2,3 and 4, is characterized by the introduction of two silver rings at a time where rings of diameter 3 to 4 mm, or reduce the length of the interlocking to introduce a single ring to bottom of the socket on diameters 32 - 40 - 42 - 50.

7-Technique according to claims 1 and 2, is characterized by the use of the flux (stripper liquid silver solder) in all the socket surfaces. 8-Technique according to claims 1, 2, 3, 4, 5 and β is characterized in that the maintenance of the parts in position during soldering, the seal at the top or bottom.

9-Technique according to claim 2 is characterized by the guarantee of stability and homogeneity of the temperature as the brazing is carried out inside the rooms to shelter from outside air and difficult weather conditions and the speed of penetration.

10-Technique according to claims 1, 2, 3, 4, 5, 6,7 and 8 is characterized by the realization of the phenomenon of capillarity with liquefied silver while chasing the air that can become embedded in the two parts walls outside at the joint.

11-Technique according to claims 1, 2, 3, 4, 5, 6, 7, 8 and 9 is characterized in that the silver ring has its diameter according to the inner diameters of the housings.

12-Technique according to claims 2 and 5, is characterized in that the heating time is lower compared to the previous method, and varies depending on the diameter.

13- Technique according to claims 1, 2, 3, 4, 5 and 8 is characterized by the confirmation of the penetration operation at the time of soldering clearly visu.

14- Technique according to claims 1,2,3,4,5,6,7,8,9,10,11, 12 and 13 is characterized in that one realizes considerable gains of materials, (silver, copper on large diameters from 32, flux) and as this solder is anti seismic it allows us to avoid maintenance and repair costs and more importantly it guarantees the safety of the installations and avoids the danger of explosion due to gas leaks.