JPS5811305B2 - Method and apparatus for producing post-mix stabilized cutting preheating flame - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermochemical surface removal technique for metal workpieces generally referred to as solvent or scarf ink. A method and apparatus for preheating a surface is contemplated.

A complete solvent cycle typically includes (1) positioning the workpiece in alignment with a solvent unit, (2) preheating the workpiece to form a weld pool, and (3) bringing the workpiece and one or more solvents into alignment. It consists of three stages: a stage in which the solvent reaction is carried out by a flow of solvent oxygen, which does not bring about relative movement between the unit and the unit.

The prior art discloses several ways to accomplish the preheating step.

U.S. Pat. No. 2,267.405 discloses preheating using a fire created by mixing oxygen and fuel gas within a torch and igniting the gas mixture as it leaves the torch. There is.

The problem with mixing oxygen and fuel gas in the torch (hereafter referred to as premixing) is that this explosive mixture can cause a flashback, i.e., it burns inside the torch.
There is a high risk of damaging the torch and presenting a safety hazard.

Improvements in premix fires are disclosed in U.S. Patent No. 2.356.
, 197, in which the oxygen and fuel gases are mixed just before being discharged from the nozzle.

Although this was an improvement in the industry, this device still suffers from flashbacks.

If the outer nozzle leaves the oxygen and fuel gas holes inside the unit open and is blocked by metal splatter, both gases will mix inside the unit, thereby creating an explosive mixture susceptible to flashbanking. generate.

US Pat. No. 3,231,431 discloses a post-mix preheating device in which the oxygen and fuel gases are mixed outside the unit, thereby completely eliminating the possibility of flashbanking.

However, the intensity of the flame produced by the subsequent mixing device is limited.

Although the method of this patent can be used to preheat hot workpieces, the low intensity flame requires an unacceptably long time to preheat cold workpieces.

U.S. Pat. No. 3,752,460 discloses a post-mixing type device that uses a flow of trapped oxygen to reduce preheat time.

Although the present invention is an improvement over the previously described apparatus, it does not achieve preheating of the still relatively cold workpiece quickly enough to meet industrial operational requirements.

U.S. Pat. No. 3,966.503 discloses a method for instant solvent start that reduces the time required to preheat the workpiece to virtually zero.

This method may have a faster start-up than the method of the present invention, but it requires a rod feed mechanism and a high intensity oxygen jet, which is not required in the present invention.

Therefore, the present invention is useful when an immediate solvent start is not required and a quick start on a cold workpiece is desired.

Prior to the present invention, portions of relatively cold metal chemical surfaces could be brought to solvent temperatures by flame without the risk of flashback and without the use of ronds, high-intensity oxygen jet blowpipes, or other aids. It was not possible to preheat quickly.

It is therefore an object of the present invention to provide a workpiece that provides an acceptably short preheating time for solvating relatively cold workpieces without the risk of flashback and without the need for auxiliary materials. An object of the present invention is to provide a method and apparatus for solvent treatment of a surface.

Another object of the present invention is to provide a method and apparatus for producing post-mix solvent preheating flames that are more intense than flames produced by the prior art.

One aspect of the present invention is to (1) preheat the point on the workpiece surface where the solvent reaction is to be initiated by directing a post-mix preheating flame thereto, where the preheating flame is (a) less one preheating oxidizing gas stream and at least one preheating fuel gas stream from separate outlets, both streams impinging outside the outlet above the workpiece surface; (b) stabilizing the preheating flame by emitting a flow of low intensity oxidizing gas, in which case the direction of the stabilizing flow; is substantially in the same direction as the direction of the flame and proximate the point of collision of the preheating oxidizing gas stream and the preheating fuel gas stream; and (c) performing steps (a) and (b) at said point. (2) then directing a stream of solvent oxidizing gas to the workpiece surface at an acute angle at said preheating point, and (3) simultaneously A method for thermochemically solvating a metal workpiece consists of creating a relative movement between a gas stream and a workpiece surface, thereby creating a solvent zone.

A second aspect of the invention comprises (a) means for forming a post-mix preheating flame; (b) means for discharging a stream of solvent oxidizing gas through a solvent nozzle; ) means for creating relative motion between the solvent oxidizing gas and the workpiece, wherein the preheating flame forming means includes (1) orifice means for discharging a flow of preheating fuel gas; (2) orifice means for discharging a flow of preheating oxidizing gas, the axis of which is oriented toward the workpiece to be solvated; orifice means oriented to intersect the axis of the fuel gas orifice means at an acute included angle outside the orifice above the surface of the workpiece; and (3) discharging a low intensity flow of stabilizing oxidizing gas. means for doing so, the orifice having an axis close to the intersection of the axis of the preheating fuel gas orifice and the axis of the preheating oxidizing gas orifice and oriented in substantially the same direction as the combined direction of the two axes. and a stabilizing oxidizing gas releasing means.

In other embodiments of the invention, the low intensity flow of oxidizing gas may pass through the point of collision of the two preheating streams and may also form an angle of 10° to 90° with the forward axis of the flame. .

The preferred oxidizing gas is oxygen and the preferred angle of impingement with the preheating gas stream is 5-50°.

A preferred embodiment uses the same orifice to discharge the preheat stabilizing oxygen stream as well as the solvent oxygen stream.

The term "oxidizing gas" is used herein to mean a gas containing an oxidant.

The preferred oxidizing gas is industrially pure oxygen, and for brevity the term simply oxygen will be used hereafter.

However, the invention may be practiced using oxidizing gases other than pure oxygen; for example, the solvent and stabilizing oxidizing gases may be oxygen having a purity of 99% or less.

However, the results are poorer than with pure oxygen, especially when using oxygen with a purity below 99%.

The preheating oxidizing gas may contain as low as 21% oxygen, i.e., it may be blown, but the preheating time will increase as the % oxygen decreases.

The term "preheating" is used to mean bringing a portion of the surface of the workpiece to its oxidizing gas ignition temperature, ie, the temperature at which the workpiece ignites when it is in an atmosphere of oxidizing gas.

In this specification, the unit "SCMH" refers to the standard state, that is, 0°C.
and m2/hour under 1 atm.

Figures 1, 2 and 3 illustrate preferred embodiments of the invention.

A typical solvent unit consists of an upper preheating block 1, a lower preheating block 2, a head 3 and a shoe 4.

Blocks 2 and 3 are called preheating blocks because preheating flames are emitted from both blocks in conventional devices.

However, in the apparatus illustrated in Figures 1-3, only the flame emitted from the upper preheating block is used for preheating.

A slotted solvent nozzle 16 emitting a sheet-like solvent oxygen stream is formed between the lower surface 20 of the upper preheating block 1 and the upper surface 21 of the lower preheating block 2 .

The lower preheating block 2 is equipped with a suitable conventional gas passage (
A row of fuel gas ports 19 are provided in communication with the fuel gas ports (not shown).

Oxygen and fuel gases are supplied to the head 3 through pipes (not shown) and thereafter supplied to the respective gas passages by means well known in the art.

The shoe 4 slides over the surface of the workpiece W in the solvent to maintain the position of the solvent nozzle at a constant distance Z (FIG. 3) from the workpiece surface.

The solvent reaction is carried out by impinging a sheet of solvent oxygen discharged from the nozzle 16 at an acute angle onto the molten pool on the workpiece surface while simultaneously creating relative motion between the workpiece and the solvent unit. Ru.

According to the invention, the upper preheating block is provided with a row of preheating fuel gas ports 17 and a row of preheating oxygen ports 18, each of which has a fuel and oxygen supply passage (not shown). None) communicate with each.

Although the drawings show the preheated oxygen port 18 positioned above the preheated fuel gas port 17, the opposite configuration is also possible.

Although it is generally preferred that the preheat fuel gas port be located between the preheat oxygen port and the stabilizing oxygen port described below, different configurations are possible.

This device operates as follows.

Preheating oxygen stream 9 from port 18 and preheating fuel gas stream 10 from port 17 impinge to form a combustible mixture.

The impact zone is represented as point 30 in FIG.

Upon ignition, the combustible mixture forms a flame 14 having a zone 13 of low intensity and a zone 12 of high intensity.

The high intensity zone 12 is located in approximately the same direction as the flame 14 and the low intensity oxygen stream 15 flows near the point of impact 30.
It has been found that by stabilizing the preheating flame by providing a preheat flame, its tip 27 can be extended to be directly above the surface of the workpiece W, thereby producing a longer and more intense flame.

The term flow passing near the point of impact means in this example that the flow passes near the point of impact 30 but not through the point of impact.

However, in other embodiments it may also pass through the collision point.

Although the term "impact point" has been used, the term impact location is more accurate since there are multiple cross-flows and therefore many impact points.

Furthermore, because the flow has a thickness, the crossover region is a band with a certain extent rather than just a point.

Therefore, for convenience, the term impingement point is used throughout this specification to mean the extent of the zone of impingement of the preheated fuel gas stream and the preheated oxidizing gas stream.

A preferred source of stabilizing oxygen stream 15 is solvent nozzle 1.
It is 6.

Conventional valve means (not shown) are provided to provide a low intensity oxygen flow 15 through the solvent nozzle 16 which is less in intensity than the original solvent oxygen flow.

Stream 15 is - in the embodiment directed in the same general direction as the flame.

That is, if the flow 15 is decomposed into two vector components, one parallel to the direction of the flame and one perpendicular to it, the vector component parallel to the flame will be oriented in the same direction as the flame.

When practicing the embodiment of the invention illustrated in FIG. 3 using the preferred values in Tables 1 and 2 below, the flame will be directed in the composite direction of the axes of the preheat oxygen port and the preheat fuel port ( is close to the bisector of the angle formed by them.

Preferably, the projections of the axes of stream 15 and flame 14 intersect to form an acute included angle, as illustrated in FIGS. 1 and 3.

It is also preferred that the axis of stabilizing stream 15 be parallel to the axis of the preheated fuel gas stream.

The preheating fuel gas flow and the preheating oxygen flow are at an acute angle, that is, from 0 to
They must collide at an angle of 90 degrees.

The preferred range is 5-50, with the most preferred collision angle being 15°.

The stabilizing oxygen stream 15 from nozzle 16 must be of lower intensity, ie, must have a lower nozzle velocity than the preheated oxygen and fuel gas from nozzles 18 and 17.

Preferably, the stabilizing oxygen nozzle speed is about 10% of the preheating stream nozzle speed.

If the preheating flame is not stabilized as described above, the length of the zone of high intensity (from the point of impact 30 to the tip 27) will be so short that the preheating phase will be acceptably short unless the separation distance Z is reduced. It cannot be achieved in time.

Reducing the separation distance Z to bring the tip of the high intensity zone of the unstabilized flame closer to the workpiece makes the solvent unit more susceptible to metal and slag splashing than would occur at normal separation distances. much more susceptible to damage.

The flame produced by mixing the fuel gas from the lower port 19 and the oxygen from the nozzle 16 is used to sustain the solvent reaction.

Although this flame is not necessary during preheating, fuel gas should be flowed from the preheating ports 19 to prevent them from clogging.

After the weld pool is formed at point B, the valve means controlling the oxygen flow from the slot 16 is adjusted to increase the strength of the oxygen flow from the low strength level to the solvent strength level and the workpiece and Relative movement between the solvent unit and the solvent unit is initiated, thereby creating a solvent ablation on the surface of the workpiece.

During the solvent run, the preheat flame formed by streams 9 and 10 is kept on at a lower intensity than during the preheat stage to help sustain the solvent reaction.

A baffle plate 28 disposed on the side of the preheating ports 17 and 18 is used to prevent flames of a low intensity level from being blown away in the solvent. There are several design factors, many of which are interdependent.

For conventional solvent equipment, the following are generally defined: (1) G, the angle between the solvent oxygen and the workpiece surface;
X, height of nozzle 16, (3) Z, separation distance, (4) U, width of solvent unit (Figure 2), (5) type of fuel gas used, (6) oxidizing property used Type of gas.

For each combination of values for the above parameters, there are operable ranges and preferred values for the variables used to design the preheating device according to the present invention.

The following two tables present examples of values found to be satisfactory in implementing the present invention.

Table 1 summarizes an example of typical parameter value combinations for conventional solvent equipment known to produce good solvents.

Table 2 presents the operable ranges and preferred values of variables that have been found to be useful in implementing the present invention when the fixed parameters are as shown in Table 2.

The variables shown in Table ■ are dependent on each other.

Therefore, if any is made to deviate significantly from the preferred value, the preferred values and operable ranges of the other variables will also change.

Of course, if any of the fixed parameters in table ■ change,
The preferred values and operable ranges for some of the variables in Table 3 also vary.

Those skilled in the art will recognize that an almost infinite number of possible combinations of values for Tables 1 and 2 will yield satisfactory results.

The preferred shape of ports 17 and 18 is circular, although other shapes may also be used.

For example, the mouth may be square or rectangular.

A single elongated preheated oxygen nozzle may be used with a single elongated preheated fuel gas nozzle.

However, the invention also works best when multiple oxygen and fuel gas ports are provided in opposing rows, as illustrated in FIGS. 2 and 10.

If multiple preheat ports are used, the spacing between the ports (dimension Y in Figure 2) should be uniform.

Each oxygen port 18 should be exactly opposite a fuel port 17.

Although this preferred arrangement provides uniform and rapid preheating, non-uniform port spacing or staggered fuel and oxygen port arrangements or combinations thereof may also be implemented.

The flame angle F, that is, the angle that the axis of the flame 14 makes with the surface of the workpiece W, is 40~ for a separation distance Z of 25 mm.
It should be in the range of 55.

If the angle F exceeds 55°, the flame will tend to gouge the workpiece.

If the angle F is less than 40°, the tip 27 of the high intensity zone 12 will be too far away from the workpiece surface T and will not provide the desired short preheating time.

The flame angle F is determined by the values of the parameters in Tables I and II.

Although the above preferred values for the variables provide satisfactory flame angles, those skilled in the art will recognize that many other useful combinations are possible.

The present invention operates optimally if the preheat fuel gas inlet and oxygen inlet are as close as possible to each other so that the gases converge within the unit, thereby not creating the possibility of premixing or flashback. .

FIG. 4 illustrates the preferred position of the starting weld pool B relative to the axis 15 of the solvent oxygen nozzle 16 when starting at the upper surface T of the workpiece W.

As illustrated in FIG. 4, the oxygen flow from the slot 16 should impinge on the back end C of the weld pool B relative to the solvent direction J.

This starting weld pool positioning allows all molten material from the weld pool to be blown forward so that nothing is left behind and no ridges or fins are formed at the back end of the solvent section.

If the start is made at one end of the workpiece W, the fifth
As shown, in that case, the solvent oxygen stream from the outlet 16 only needs to impinge on any portion of the starting solvent zone to achieve satisfactory results.

This is because in this case, the workpiece surface T does not exist up to the rear edge of the molten pool where a bump may be formed, and it does not matter whether fins are formed on the end surface E or not.

Figures 7-14 illustrate embodiments of the present invention capable of producing a stabilized post-mix preheat flame.

FIG. 7 is similar to that shown in FIGS. 1-3, except that the preheating oxygen port and fuel gas port 18 and 17 are connected to the lower block 2.
FIG. 4 is a side view of a solvent unit that differs in that it is positioned within the interior;

This device operates in the same manner as the device of FIGS. 1-3.

Figures 8 and 9 show that the stabilizing oxygen is in the solvent oxygen slot 1.
6 shows a configuration in which it is supplied from a separate port 16'.

Here, a preheated oxygen stream 9 from port 18 impinges on a preheated fuel gas flow 10 from port 17 to form a postmixed flame 14.

The flame is stabilized by a low intensity oxygen flow 15' directed from the mouth 16' close to the point of impact 30 and approximately in the direction of the flame.

Preheating and stabilization ports 17, 18 and 16' are located in the upper block 1.

These can also be located within the lower block 2.

After preheating is achieved, the flow of solvent oxygen from slot 16 is turned on to solvent the workpiece.

As previously mentioned, the fuel gas released from port 19 helps sustain the solvent reaction.

FIG. 10 is the same as FIG. 9 except that the stabilizing oxygen is ejected from a single elongated slotted nozzle 16''.

Although it is not preferable to arrange the preheating oxygen and fuel to be discharged from the elongated slotted nozzle, it is possible in practice.

FIG. 11, like FIG. 8, is a side view of an apparatus having a stabilizing oxygen port 16' separate from the solvent oxygen port 16.

However, the stabilizing oxygen stream 15' passes through the impingement point 30 of the preheating oxygen stream 9 and the preheating fuel gas stream 10.

Although baffles 28 and 28' are not absolutely necessary, it has been found that they increase the range within which the flow rate of the preheating and stabilizing streams can be varied and still produce a stabilized flame.

A baffle near the fuel gas inlet is particularly useful if the fuel gas inlet is not between the preheat and stabilizing oxygen ports.

FIG. 12 is a side view of an apparatus in which the stabilizing and solvent oxygen is constructed from the same nozzle as in FIG. 3, namely nozzle 16.

However, in FIG. 12, the stabilizing oxygen passes through the impingement point of the preheat flow.

Although this configuration is not as preferred as the embodiment of FIG. 3, it can produce a stabilized preheat flame if the point of impact 30 is located above the workpiece.

Preferably, the stabilizing oxygen flow is directed in approximately the same direction as the flame.

As mentioned above, this means that if the stabilizing oxygen flow is decomposed into two vector components, one parallel to the flame direction and one perpendicular to the flame direction, then the vector component parallel to the flame will be in the same direction as the flame. It means to be oriented.

However, it has been found that stabilizing flames that can result in short preheat times may be formed whether the stabilizing oxygen flow is directed perpendicular to the flame or opposite to the general direction of the flame. Ta.

FIG. 13 is a side view of the device in which the stabilizing oxygen stream 15' is not directed in the same direction as the flame.

Here, a preheating oxygen stream 9 and a preheating fuel gas stream 10 are shown.
As mentioned above, the two collide at the collision point 30 to form the post-mixing flame 14.

The flame has a forward axis 22 defined as the portion of the line on the flame central axis forward of the point where the stabilizing oxygen flow intersects the flame central axis.

The term "forward" as used herein means the same direction as the tip of the V-shape formed by the collision of the preheating flows.

Therefore, if the stabilizing oxygen flow forms an angle A of greater than 90 degrees with the forward axis 22 of the flame, the stabilizing flow is said to be in approximately the same direction as the flame.

However, it has been found that even if the angle A is between 10° and 90°, a stabilized flame is still formed.

It should be noted that the position of the flame relative to the composite direction of the preheat oxygen and fuel port axes (i.e. the bisector of the angle between them) is influenced by the direction, velocity and flow rate of the stabilizing oxygen. .

In FIG. 13, a stabilizing oxygen stream 15' passes close to and in front of the impingement point of the preheat stream.

Satisfactory results may also be achieved if the stabilizing oxygen flow is directed aft of the point of impact.

FIG. 14 is a side view of a device similar to FIG. 13, but with the stabilizing oxygen stream 15' passing through the point of impingement of the preheat stream.

This configuration may also produce satisfactory results.

Without wishing to be bound by any particular theory, let us attempt a possible explanation of how the present invention achieves the reduced preheat time.

It has been observed that unstable post-mixing flames formed by collisions of preheated fuel gas and preheated oxygen alone tend to have a relatively large low intensity band and a very small high intensity band. .

In some cases, high intensity bands are not even noticeable.

Additionally, unstabilized post-mixing flames are susceptible to fluctuations.

The fluctuations became more pronounced if attempts were made to increase the strength of the unstabilized flame by increasing the flow rates of preheating oxygen and preheating fuel gas.

Eventually, the unstable flame was blown out of the preheat outlet by the increasing gas flow rate and extinguished.

It has been observed that the baffle helps to hold the flame in place and allows for a somewhat higher preheat gas flow rate before the flame is extinguished.

When a post-mixing flame is stabilized with a low intensity oxygen flow according to the present invention, the stabilized flame develops a long, distinct high intensity band and ceases to fluctuate.

The flame remains stable even when the flow of preheated fuel gas and preheated oxygen is increased to a flow rate greater than that which would extinguish an unstable flame.

It is believed that the beneficial effects of stabilizing flow, particularly when directed as illustrated in FIG. 3, are realized for the following reasons.

(1) Since the stabilizing oxygen is added to the low intensity stream, it does not interfere with the external mixing of the preheating oxygen and preheating fuel gas streams.

Moreover, the stabilizing oxygen adds oxygen to help support combustion and provides an oxygen atmosphere surrounding the high flame intensity zone.

This oxygen atmosphere provides an excellent medium for the flame to spread back toward the preheat vents and ignite the unburned fuel gas near these ports.

(2) The stabilizing oxygen stream also forms a shield that protects the flame from air that does not provide as good a flame propagation medium as oxygen, destabilizes the flame, and blows out the outlet.

Based on Tables ■ and ■, <Example> Solvent start was carried out on the top surface of the workpiece in the laboratory as shown in Figure 4 using an apparatus having the values presented in Table ■ and the preferred values in Table ■. Ta.

The results of the test are represented graphically by curve X in FIG.

In FIG. 6, the initial temperature of the workpiece (T° C.) is plotted on the vertical axis, and the required preheating time (t, seconds) is plotted on the horizontal axis.

For comparison purposes, curve Y shows the results obtained under equivalent conditions using the solvent apparatus disclosed in U.S. Pat. No. 3,752,460, while curve Z shows the results obtained under equivalent conditions using the solvent apparatus disclosed in U.S. Pat.
The results obtained with a conventional post-mix preheating flame formed by oxygen and fuel jets emitted from a solvent nozzle as disclosed in US Pat.

As illustrated in FIG. 6, for hot workpieces, the present invention provides a significant improvement over prior art preheating methods, and for workpieces above 200°C, curve Y Provides a preheat time less than half the time required by the method.

For workpieces below 200°C, the present invention requires much less than half the time.

This graph shows curve Y, where the trap oxygen method cannot achieve a preheating time of less than 20 seconds for workpieces below 250°C, while the present invention takes less than 20 seconds to preheat even workpieces at 0°C. Please note that this indicates that

Based on FIG. 11 (Example 1) A postmixed stabilized flame was produced by colliding two preheating streams and one stabilizing stream at a common point as shown in FIG. 11.

Table 1 presents operable ranges and preferred values for variables useful in practicing the invention.

As shown in Table ■, the variables depend on each other.

Deviations from the preferred value of one variable change the operable range and preferred value of other variables.

Preferred values for variables not listed in Table ■ are the same as listed in Table ■.

Based on FIG. 13, Example Table 2 presents the operable ranges and preferred values of variables useful in implementing the invention according to FIG.

As in the previous table, these values are dependent on each other.

Changing one value changes the range of other factors.

Preferred values for variables not listed in Table ■ are the same as those listed in Table ■.

[Brief explanation of the drawing]

FIG. 1 is a side view of a solvent unit illustrating a preferred embodiment of the present invention. FIG. 2 is a front view taken along line 2-2 in FIG. 1. FIG. 3 is an enlarged side view of FIG. 1 showing important elements of the invention. FIG. 4 shows the preferred location of the solvent pool relative to the solvent oxygen flow for solvent start at a flat portion of the workpiece surface. Figure 5 shows solvent start at the edge of the workpiece surface. FIG. 6 is a graph comparing preheat times obtained by practicing the present invention with the prior art. FIG. 7 illustrates an embodiment of the invention in which the preheating stream is discharged from the lower preheating block of the solvent apparatus. FIG. 8 is a side view of a portion of the apparatus with separate stabilizing and solvent oxygen ports. FIG. 9 is a front view taken from the direction of line 9--9 in FIG. 8. FIG. 10 is a front view showing a modification of the device shown in FIG. 8. FIG. 11 is a side view of an apparatus with separate stabilizing oxygen and solvent oxygen ports such that the stabilizing and preheating streams impinge at a common point. FIG. 12 is a side view of a device similar to FIG. 3, but where the stabilizing and preheating streams collide at a common point. FIG. 13 is a side view in which the stabilizing flow is directed near the point of impingement of the preheating flow, but not in the same direction as the flame. FIG. 14 is a side view of a device similar to FIG. 13 in which the stabilizing stream passes through the point of impingement of the preheating stream. 1: Upper preheating block, 2: Lower preheating block, 3: Head, 4: Shoe, 16: Solvent nozzle, 16': Stabilizing oxygen port, 17: Preheating fuel gas port, 18: Preheating oxygen port, 9 :Oxygen flow for preheating, 10:Fuel flow for preheating, 30
: impact point, 14: flame, 13: low intensity zone, 12: height zone, 15° 15': stabilizing oxygen flow.

Claims (1)

[Scope of Claims] 1. A method of thermochemically solvating a metal workpiece with a solvent oxidizing gas, the method comprising: applying a mixed preheating flame to a point on the workpiece surface where a solvent reaction is to be initiated; preheating the oxidizing gas to the ignition temperature by directing at least one preheating oxidizing gas stream and at least one preheating fuel gas stream to separate discharges in the solvent system. with separate oxidizing gas streams discharging from the outlet and impinging on each other at acute angles outside the outlet above the workpiece surface and having an intensity lower than that of the solvent oxidizing gas. formed by stabilizing the preheating flame, directing a stream of solvent oxidizing gas from a slotted nozzle in the solvent apparatus to the workpiece surface at an acute angle at the preheating point, and simultaneously controlling the solvent oxidizing gas stream and processing. A method of thermochemically solvating metal workpieces, which consists in creating a relative movement between the object and the surface, thereby creating a solvent zone. 2. The method of claim 1, wherein the acute angles of the preheating oxidizing gas flow and the fuel gas flow are between 5 and 50 degrees. 3 Claim 2 in which the oxidizing gas is oxygen
The method described in section. 4. The method according to claim 3, wherein the stabilizing oxidizing gas and the solvent oxidizing gas are discharged from the same port. 5 Preheating fuel gas flow rate is 1 to 3.538CM per flow
H and the preheating oxidizing gas flow rate is 1.5 per flow.
~6SCMH, and further stabilizing oxidizing gas is 3~1
3. The method of claim 2, wherein the method is discharged at a flow rate of 0.0105C. 6 The direction of the stabilizing oxidizing gas flow is aligned with the flame axis.
2. The method of claim 1, wherein the preheating oxidizing gas stream and the preheating fuel gas stream are passed close to the point of impingement, forming an angle of between 90° and 90°. 7 The direction of the stabilizing oxidizing gas flow is aligned with the flame axis.
2. The method of claim 1, wherein the preheating oxidizing gas stream and the preheating fuel gas stream form an angle of ~90[deg.] and pass through the point of impingement. 8. In a solvent apparatus comprising an upper preheating block and a lower preheating block and solvent nozzle means between the upper and lower preheating blocks for discharging the solvent oxidizing gas after completion of preheating, discharging a preheating fuel gas stream. at least one first
a nozzle means and at least one second nozzle means for discharging a preheating oxidizing gas flow, the axes of the first and second nozzle means being at points external to the first and second nozzle means; first and second nozzle means arranged to intersect at an acute angle to provide a post-mixing preheating flame; A solvent device characterized by comprising means for 9 The acute included angle of the axes of the first and second nozzle means is 5°.
9. The apparatus of claim 8, wherein the angle is ˜50°. 10. The apparatus of claim 8, wherein the means for discharging the stabilizing oxidizing gas and the means for discharging the stream of solvent oxidizing gas constitute one common outlet. 11. The manufacture of claim 8, wherein the first and second nozzle means each comprise a plurality of orifices in rows, the rows being substantially parallel to each other. 12. The first nozzle means orifice row and the second nozzle Claim 1 wherein the stage orifice row is located in the upper preheating block.
The device according to item 1. 13. The apparatus of claim 11, wherein the first nozzle means orifice row and the second nozzle single stage orifice row are located within the lower preheat block.