TW202015846A - Welding method using alloy powder as welding filler material - Google Patents

Abstract

The present invention discloses a welding method using alloy powder as welding filler material. In the present invention, at least five kinds of powdered metal elements are mixed based on a proper mixing ratio so as to form a HEA powder. Subsequently, the HEA powder is filled into a groove formed between two base metals, such that a root pass is formed on the bottom of the groove by using GTAW equipment. Consequently, a full-penetration weld pass is formed in the groove by repeatedly filling the HEA powder into the groove and then arc melting the HEA powder. Particularly, the HEA powder comprises a plurality of micro-scale alloy particles. Therefore, the weld pass made of the HEA powder possesses many outstanding characteristics, including fine micro structure, high specific strength, high fracture resistance, high tensile strength, and high resistant to corrosion and oxidation.

Description

Welding method using alloy powder as welding filler

The invention relates to the related technical field of welding process, in particular to a welding method using alloy powder as welding filler.

Welding (also referred to as welding) is a process technology that achieves permanent bonding between two base materials by heating to form an atom-to-atom bond between the surfaces of the two base materials. Welding can be achieved in the following three ways: (1) Real welding: heating the base material to be joined to melt it locally to form a molten pool, which will solidify after cooling and then join the base material to be joined. If necessary, the filler metal melt can be added to the molten pool when heating the base material to achieve the best welding effect; (2) Soldering or brazing: there is no need to melt the base material itself, but only the melting point is heated separately Lower filler metal, and use the capillary and chemical bonding of the filler metal melt to connect the two base materials; and (3) forging welding: first heat the two base materials to make them incandescent, and then use pressure or The way of vibration makes the two base materials join each other.

Not all metal parts can be joined using the above welding method. For example, when welding titanium and stainless steel, the weld between the two will form a brittle intermetallic phase (TiFe, TiFe ₂ or TiC) due to the active nature of titanium. Although existing commercial solder metals include aluminum-based, copper-based, iron-based, or nickel-based superalloys, they are still not suitable as filler metals for the welding process of specific heterogeneous base materials (eg, titanium and stainless steel). In view of this, China Patent No. CN104476010B discloses a high-entropy alloy (high-entropy alloys) welding wire, wherein the composition of the high-entropy alloy welding wire includes: 5 at% titanium element, 1-20 at% iron element, 25- 30 at% chromium, 25-35 at% copper, and 25-35 at% nickel. Because the high-entropy alloy has excellent mechanical properties, when the high-entropy alloy is processed into a welding wire and applied as a filler metal for welding stainless steel and titanium, it will not generate a brittle intermetallic phase in the weld.

Fig. 1 is a structural diagram of a conventional welding system, wherein the conventional welding system includes: a welding torch 21', an arc welding power supply device 22' and a gas supply device 23'. It can be found from Fig. 1 that due to the limited length of the high-entropy alloy welding wire HE', it may be necessary to supplement the high-entropy alloy one or more times when welding the left base material 11' and the right base material 12' on a large scale Welding wire HE', resulting in unsmooth welding process. At the same time, in addition to affecting the setting and selection of the output current of the arc welding power supply device 22', the length and diameter (or thickness) of the high-entropy alloy welding wire HE' also limits the left base material 11' and the right base material 12' Joint design. For example, FIG. 1 shows that the left base material 11' and the right base material 12' adopt a standard joint design (ie, horizontal joint); however, once the left base material 11' and the right base material 12' are adopted Non-standard joining method, it may be difficult for the high-entropy alloy wire HE' to feed into the joining groove 13' between the left base material 11' and the right base material 12'; in this case, the left base material 11' and the right The base material 12' may not be able to form a weld with a sufficient length and/or thickness through arc welding. On the other hand, when welding two base materials with a thickness greater than 5mm, the two base materials must be grooved and welded on the surface of the two base materials; then turn over to complete the two pieces After back gouging treatment on the bottom surface of the base material, welding is repeated once on the bottom surface to increase strength.

It can be seen from the above description that the proposal of the high-entropy alloy welding wire has greatly expanded the types and quantities of alloy solders, but there are still many limitations and defects when it is actually used in the welding process. Therefore, it is necessary to improve the known welding method using high-entropy alloy welding wire as welding filler. In view of this, the inventor of this case tried his best to research and invent, and finally developed a welding method using alloy powder as a welding filler of the present invention.

The main purpose of the present invention is to propose a welding method using alloy powder as a welding filler. In particular, the present invention is based on mixing powders of at least five metal elements into a high-entropy alloy powder as a welding filler based on an appropriate ratio, and then filling the high-entropy alloy powder into a joint groove between two base materials in. Continue to use the arc welding technology to complete the initial welding (root welding) in the joint groove, and then repeat the action of filling the high-entropy alloy powder and welding until the weld between the two base materials Up to a predetermined length and/or thickness. In the present invention, the high-entropy alloy powder is composed of a plurality of alloy particles, and the size of the alloy particles is on the order of micrometers. In addition, the elemental composition of the high-entropy alloy powder is determined by the material of the base material. Therefore, when the high-entropy alloy powder is used as the welding filler, the weld formed between the two base materials will have a fine ultra-fine structure, while also improving the specific strength, fracture resistance, tensile strength, and corrosion resistance Features such as anti-oxidation ability.

In order to accomplish the above object of the present invention, the inventor of the present invention provides an embodiment of the welding method using alloy powder as the welding filler, which includes the following steps: (1) providing an alloy powder as a welding filler; (2) preparing A first base material and a second base material, and a bonding groove is formed between a first bonding surface of the first base material and a second bonding surface of the second base material; (3) Two ends of the joint groove are respectively connected with a head end arc starting piece and a tail end arc starting piece, and a welding pad is connected to the bottom of the joint groove; (4) The alloy powder is filled into the joint groove (5) Operate a welding gun with a welding system to ignite the arc at the head end arc starting piece, and then make the welding gun move straight along the joining groove to the tail end arc starting piece; (6) again Fill the alloy powder into the joint groove and repeat the step (5); and (7) repeat the step (6) until the joint groove has been completely filled by a weld.

In order to be able to more clearly describe a welding method using alloy powder as a welding filler proposed by the present invention, the preferred embodiments of the present invention will be described in detail below with reference to the drawings.

Before beginning to explain the execution steps of a welding method using alloy powder as welding filler of the present invention, a welding system must be briefly introduced. 2 is a structural diagram of a welding system, and the welding system at least includes: a welding torch 21, an arc welding power supply device 22 and a gas supply device 23. Next, FIG. 3 is a flow chart of a welding method using alloy powder as a welding filler of the present invention. It can be seen from FIG. 3 that the welding method of the present invention using alloy powder as the welding filler (hereinafter referred to as the welding method of the present invention) includes 7 main steps. The welding method of the present invention first performs step S1: providing an alloy powder AP as a welding filler. Here, the alloy powder AP is composed of a plurality of alloy particles, and the size of the alloy particles is in the order of micrometers. For example, the average size of the alloy particles may be between 1-100 microns. On the other hand, there are three ways to obtain alloy powder AP. One is to use five to eleven main metal elements to make a high-entropy alloy ingot, welding wire or electrode, and then cut the high-entropy alloy ingot, welding wire or electrode into high-entropy alloy powder. The second system is obtained by the atomization method, that is, it is first melted into the alloy liquid state by the melting method, and then broken into droplets and solidified into powder particles by the water spray method, the gas spray method, the centrifugal atomization method or the rotary electrode atomization method. Another method is to first determine an elemental composition of the high-entropy alloy powder according to the material of the welding base material, and then mix powders of at least five metal elements into a high-entropy alloy composite powder based on the elemental composition. Since these three methods are aimed at obtaining high-entropy alloy powder, there is a percentage between the number of moles of each main metal element contained in the powder and the total number of moles of all alloy elements, and the percentage must be between 5% Between 35%. For definitions of high-entropy alloys, medium-entropy alloys and low-entropy alloys, please refer to Document 1 and Document 2, respectively, "High-Entropy Alloys", 2014, 1st edn. BS Murty, JW Yeh, S. Ranganathan, Elsevier Publisher, London, UK, pp. 13-25, and "High-Entropy Alloys – Fundamentals and Applications", 2016, 1st edn. MC Gao, JW Yeh, PK Liaw, Y. Zhang ( eds), Springer International Publishing, Cham, Switzerland, pp. 8-12.

Of course, the medium entropy alloy powder AP can also be obtained by alloy design for joining to obtain a weld bead with excellent properties; wherein, the element composition of the alloy powder AP of the medium entropy alloy is composed of three to four main metal elements, according to As defined in the previous literature, the mixing entropy of medium-entropy alloys is between 1 and 1.5R, where R is the gas constant. Nonetheless, the exemplary embodiment of the present invention uses five metal elements such as iron, manganese, chromium, nickel, and aluminum to make a high-entropy alloy powder AP, and the composition of the alloy powder AP may be, for example, in an atomic ratio It is expressed as Al _0.3 CrFe _1.5 MnNi _0.5 . In addition, the composition of the alloy powder AP can also be expressed in terms of atomic percentage as Al ₇ Cr _27.6 Fe ₃₅ Mn _27.7 Ni _14.3 or Al _0.5 CrFe _1.5 MnNi _0.5 (Al ₁₁ Cr _22.5 Fe ₃₃ Mn _22.5 Ni ₁₁ ). Continue to refer to FIG. 2 and FIG. 3, and please refer to FIG. 4 at the same time, which is a schematic diagram of the manufacturing process of step S2 and step S3 in the method flow. After completing step S1, the welding method of the present invention then proceeds to step S2: prepare a first base material 11 and a second base material 12, and make a first joint surface of the first base material 11 and the second A bonding groove 13 is formed between a second bonding surface of the base material 12. It is conceivable that the types or materials of the first base material 11 and the second base material 12 are not limited, and may be steel plates or carbon steels that often need to be welded. Further, in step S3, a head end arc starting member 14 and a tail end arc starting member 15 are respectively connected to both ends of the joint groove 13, and a welding pad is connected to the bottom of the joint groove 13 16.

FIG. 5 shows multiple sets of side cross-sectional views of the first base material and the second base material, and FIG. 6 also shows sets of side cross-sectional views of the first base material and the second base material. The present invention does not particularly limit the forms of the first bonding surface of the first base material 11 and the second bonding surface of the second base material 12. For example, FIG. 5 shows that the first bonding surface and the second bonding surface are mutually symmetrical, and a gap is formed between the bottom side of the first bonding surface and the bottom side of the second bonding surface RG. In addition, the side sectional view (a) of FIG. 5 shows that the bonding groove 13 surrounded by the first bonding surface and the second bonding surface has a Y-shaped groove. In addition, the side sectional view (b) of FIG. 5 shows that the bonding groove 13 enclosed by the first bonding surface and the second bonding surface has an I-shaped groove. Furthermore, the side cross-sectional view (c) of FIG. 5 shows that the bonding groove 13 surrounded by the first bonding surface and the second bonding surface has an X-shaped groove. On the other hand, the side sectional view (d) of FIG. 5 shows that the bonding groove 13 surrounded by the first bonding surface and the second bonding surface has a U-shaped groove.

Of course, the form of the first joint surface of the first base material 11 and the second joint surface of the second base material 12 may also be two surfaces that are asymmetric to each other. For example, the side sectional view (a) of FIG. 6 shows that the bonding groove 13 surrounded by the first bonding surface and the second bonding surface has a single-sided V-shaped groove. In addition, the side sectional view (b) of FIG. 6 shows that the bonding groove 13 surrounded by the first bonding surface and the second bonding surface has a J-shaped groove. On the other hand, the side sectional view (c) of FIG. 6 shows that the bonding groove 13 surrounded by the first bonding surface and the second bonding surface has a K-shaped groove. In an exemplary embodiment of the present invention, the bonding groove 13 surrounded by the first bonding surface and the second bonding surface has a Y-shaped groove (as shown in side sectional view (a) of FIG. 5 ). It is worth noting that in this Y-shaped groove, both the first joint surface and the second joint surface have an inclination angle of 60 ^° , and the size of the root gap RG is about 2 mm.

Continuing to refer to FIG. 2 and FIG. 3, and referring to FIG. 7 at the same time, is a perspective view showing the first base material, the second base material, the head end arc starting piece, and the tail end arc starting piece. As shown in the figure, the head-end arc starting member 14 is coupled to one end of the engaging groove 13; and, a first groove 141 may be correspondingly provided on the head-end arc starting member 14 to correspond to the engaging groove 13. On the other hand, the tail end arc starting member 15 is coupled to the other end of the engaging groove 13; similarly, a second groove 151 may be correspondingly provided on the tail end arc starting member 15 to correspond to the joining groove槽13. 13. Slot 13. Please continue to refer to FIG. 8 and FIG. 9, wherein FIG. 8 is a perspective view showing the first base material, the second base material, and the welding pad, and FIG. 9 shows the first base material, the second base material, and the welding liner Side cross-sectional view of the pad. After step S3 is completed, the welding pad 16 (or pad) is bonded to the bottom of the bonding groove 13. It is worth noting that FIG. 8 shows that a first recess 161 and a second recess 162 that are symmetrical to each other are formed on the surface of the welding pad 16. However, FIG. 9 further shows that, in some different applications, the first recess 161 and the second recess 162 that are asymmetric to each other may also be formed on the surface of the welding pad 16.

Continue to refer to Figures 2 and 3. After completing step S3, the welding method of the present invention then executes step S4: filling the alloy powder AP into the joining groove 13. Since the welding pad 16 is connected to the bottom of the bonding groove 13, the alloy powder AP filled in the bonding groove 13 must cover the surface of the bonding pad 16. Next, in step S5, a welding torch 21 of the welding system 2 is operated to ignite the arc at the head end arc starting member 14, and then the welding gun 21 is moved linearly along the joining groove 13 to the tail end arc starting member 15 places. In this way, the high heat of the arc will melt part of the first bonding surface of the first base material 11, part of the second bonding surface of the second base material 12, and the alloy powder AP, and then form a molten pool in the bonding groove 13 and the weld WB is formed after the molten pool cools. When the steps of the welding method of the present invention are executed to this point, a root pass is formed at the bottom of the bonding groove 13. It is particularly worth mentioning that the filling of the powder may not cover the joint groove 13 at one time. An automatic powder feeder can be used to keep the filling of the powder at the front edge of the position of the welding gun 21, and the welding gun 21 can be moved forward at any time. There is new powder for melting. In addition, the powder can also be wrapped in a thin metal tube (made of some constituent elements, such as a thin iron tube), and made into a cored welding wire, which is directly output from the welding gun 21 muzzle through the wire feeder to generate an arc and be melted by heat. The molten metal is directly filled into the bonding groove 13 to form a weld bead.

Continuing, the welding method of the present invention then executes step S6: filling the alloy powder AP into the joining groove 13 again, and repeatedly performing step S5. Moreover, the welding method further performs step S7: repeatedly performing the step S6 until the joining groove 13 has been completely filled with the welding seam WB. It is worth noting that before performing the step S6 and the step S7, the welding pad 16 can be removed first. The main reason is that a so-called root bead has been formed on the bottom of the bonding groove 13. Of course, in the case where the welding pad 16 has not been removed, steps S6 and S7 can still be performed. FIG. 10 is a perspective view showing the first base material, the second base material, the welding seam, and the welding pad. As shown in FIGS. 8 and 10, since the first recessed portion 161 and the second recessed portion 162 are formed on the surface of the welding pad 16, after the step S5 is completed, the welding seam WB will have a penetration portion WBP located in the Between the bottom of the engaging groove 13 and the two recesses (161, 162). It can be seen that the welding method of the present invention only needs to complete the welding procedure on the surfaces of the first base material 11 and the second base material 12 to form a good weld WB to join the two base materials. Then, the bottom surfaces of the first base material 11 and the second base material 12 are back gouging treated, and then the repetitive welding procedure is performed on the bottom surfaces of the two base materials.

Although FIGS. 5 and 6 show that the joint groove 13 between the first base material 11 and the second base material 12 has a root gap RG, this is not a limitation on the design that the joint groove 13 must have a root gap RG. . 11 and 12 both show side cross-sectional views of the first base material and the second base material. In FIG. 11, the first bonding surface of the first base material 11 and the second bonding surface of the second base material 12 are two surfaces symmetrical to each other. On the other hand, in FIG. 12, the first bonding surface of the first base material 11 and the second bonding surface of the second base material 12 are two asymmetric surfaces. It is worth noting that both FIGS. 11 and 12 show that the bonding groove 13 formed between the first bonding surface and the second bonding surface does not have a root gap RG. Here, it must be particularly emphasized that even if the bonding groove 13 does not have the design of the root gap RG, after the step S5 is completed, the weld WB will still have a penetration portion WBP located at the bottom of the bonding groove 13 and the welding pad 16 between the two depressions (161, 162). The main reason is that when performing arc welding, part of the first base material 11, part of the second base material 12, and alloy powder AP are simultaneously melted by high heat.

Continuing to refer to FIG. 13, it shows a side view of the first base material, the head end arc starting piece, the tail end arc starting piece, and the welding gun. It must be added that when performing step S5, the welding gun 21 can have an inclination angle ranging from 20 ^o to 45 ^o ; or, the welding gun 21 and a normal n can have a range of 70 An angle between ^o and 45 ^o , where this angle is called the trailing angle. On the other hand, the welding method of the present invention mainly uses arc welding to complete the welding process, and the arc welding techniques that can be applied to the present invention include: submerged arc welding (SAW), metal arc welding (Metal arc welding) welding (MAW), inert gas 金 is metal arc welding (GMAW), inert gas tungsten arc welding (GTAW), atomic hydrogen arc welding (AW), and Carbon arc welding (CAW). The welding system shown in FIG. 2 is inert gas tungsten arc welding (GTAW), and the welding gun 21 is a TIG welding torch (Tungsten inert gas welding torch); and, when the step S5 is performed, a gas supply device 23 passes through the welding gun 21 A shielding gas is provided to the joining groove 13 so that the shielding gas is used to prevent the alloy powder AP in the molten state from being oxidized when the alloy powder AP is melted by the arc.

Continuing to refer to FIG. 14, it shows an architectural diagram of a welding system. In order to facilitate the application of the welding method of the present invention to complete the welding process of the first base material 11 and the second base material 12, a powder mixing device 24 may be used to complete step S1 to mix the powders of five to eleven main metal elements Into the alloy powder AP. Further, in step S4, a powder supply device 25 (such as a spray gun or a powder supply tube) may be used to inject alloy powder AP into the joining groove 13. Please refer to FIGS. 15 and 16 at the same time, which are side views of the first base material, the second base material and the joint groove. 15 shows that the first base material 11 and the second base material 12 are vertically joined, and the first joint surface of the first base material 11 and the second joint surface of the second base material 12 are asymmetric two surfaces. On the other hand, in FIG. 16, the first base material 11 and the second base material 12 are also vertically joined, but the first joint surface of the first base material 11 and the second joint surface of the second base material 12 are symmetrical to each other Two sides. It can be inferred from FIGS. 14, 15 and 16 that even if the first base material 11 and the second base material 12 are vertically joined, as long as the angle or shape of the feeding tube 251 of the powder supply device 25 is appropriately adjusted or changed, it can still be used The powder supply device 25 smoothly injects the alloy powder AP into the joining groove 13. That is to say, even if the non-standard bonding design (ie, non-horizontal bonding) is adopted between the first base material 11 and the second base material 12, the welding method of the present invention can still achieve the first base material 11 and the second base material Perfect welding between the materials 12.

In this way, the above system has completely and clearly explained a welding method of the present invention using alloy powder as a welding filler; and, through the above, it can be seen that the present invention has the following advantages:

(1) Unlike conventional technologies, which generally use alloy welding wire as welding filler, the present invention proposes a welding method using alloy powder as welding filler. The present invention is based on mixing powders of at least five metal elements into a high-entropy alloy powder as a welding filler based on an appropriate ratio, and then filling the high-entropy alloy powder into a bonding groove between two base materials. Continue to use arc welding technology to complete the initial welding (root welding) in the joint groove, and then repeatedly perform the action of filling high-entropy alloy powder and welding until the weld reaches a predetermined length and thickness. Since the present invention uses high-entropy alloy powder as the welding filler, the weld formed between the two base materials has a fine ultra-fine structure, and also improves the specific strength, fracture resistance, tensile strength, corrosion resistance and corrosion resistance. Oxidizing ability and other characteristics.

(2) On the other hand, in conjunction with the use of powder supply devices (such as spray guns or powder supply tubes), even if a non-standard joint design (ie, non-horizontal joint) is used between the two base materials, the welding method of the present invention is still It is possible to achieve perfect joining of the two base materials.

It must be emphasized that the above detailed description is a specific description of possible embodiments of the present invention, but this embodiment is not intended to limit the patent scope of the present invention, and any equivalent implementation or change without departing from the technical spirit of the present invention, Should be included in the patent scope of this case.

<The present invention> 21: welding torch 22: Arc welding power supply device 23: Gas supply device S1-S7: Step AP: alloy powder 11: First base material 12: Second base material 13: Joint groove 14: arc from the head 15: End arc 16: Welding pad RG: root gap 141: The first groove 151: Second groove 161: The first depression 162: Second depression WB: Weld seam WBP: Penetration Department n: normal 24: powder mixing device 25: Powder supply device 251: Feed tube 2: Operate the welding system

<Xizhi> 21’: Welding torch 22’: Arc welding power supply 23’: gas supply HE’: High-entropy alloy welding wire 11’: Left base metal 12’: Right base material 13’: Joint groove

Fig. 1 is a diagram of a conventional welding system; Fig. 2 is a diagram of a welding system; Fig. 3 is a flow chart of a welding method of the present invention using alloy powder as a welding filler; Fig. 4 Process schematic diagram showing steps S2 and S3 in the method flow; FIG. 5 is a cross-sectional view showing multiple groups of the first base material and the second base material; FIG. 6 is a multiple group showing the first base material and the second base material Side cross-sectional view; Fig. 7 is a perspective view showing the first base material, the second base material, the head end arc starting piece, and the tail end arc starting piece; Fig. 8 shows the first base material, the second base material, and the welding liner Fig. 9 is a side sectional view showing the first base material, the second base material, and the welding pad; Fig. 10 is a perspective view showing the first base material, the second base material, the welding seam, and the welding pad; 11 shows the side cross-sectional view of the first base material and the second base material; FIG. 12 shows the side cross-sectional view of the first base material and the second base material; FIG. 13 shows the first base material, the arc starting piece at the head end, and the tail end Side view of the arc starting piece and the welding torch; FIG. 14 is a structural view of a welding system; FIG. 15 is a side view of the first base material, the second base material and the bonding groove; and FIG. 16 is a first base material Side view of the material, the second base material and the joining groove.

S1-S7: Step

Claims (16)

A welding method using alloy powder as welding filler includes the following steps: (1) Provide an alloy powder as a welding filler; (2) Prepare a first base material and a second base material, and make the first A bonding groove is formed between a first bonding surface of the base material and a second bonding surface of the second base material; (3) A head-end arc starting piece and a tail end are respectively connected to both ends of the bonding groove Start the arc and connect a welding pad to the bottom of the joint groove; (4) Fill the alloy powder into the joint groove; (5) Operate a welding gun with a welding system from the head end The arc is ignited at the arc, and then the welding torch is moved linearly along the joint groove to the end arc starting part; (6) The alloy powder is filled into the joint groove again, and the step is repeated (5 ); and (7) Repeat this step (6) until the joint groove has been completely filled by a weld. The welding method using alloy powder as the welding filler as described in item 1 of the patent application scope, wherein the welding system uses an arc welding technique to complete the welding of the first base material and the second base material, and the arc welding The technology can be any of the following: Submerged arc welding (Submerged arc welding, SAW), 金Metal arc welding (MAW), inert gas 金Metal arc welding (GMAW), inert gas tungsten electrode Electric arc welding (Gas tungsten arc welding, GTAW), atomic hydrogen arc welding (Atomic-hydrogen arc welding, AHW), or carbon arc welding (Carbon arc welding, CAW). As described in item 1 of the patent application scope, a welding method using alloy powder as a welding filler, wherein the alloy powder is composed of a plurality of element powder particles, and the size of the element powder particles is in the micrometer grade. The welding method using alloy powder as the welding filler as described in item 1 of the patent application scope, wherein the alloy powder is a high-entropy alloy powder, and the high-entropy alloy powder includes five to eleven main metal elements ; And, there is a percentage between the number of moles of each main metal element and the total number of moles of all elements, and the percentage is between 5% to 35%. As described in item 1 of the patent application scope, a welding method using alloy powder as a welding filler, wherein the alloy powder includes five main metal elements, and the five main metal elements are iron, manganese, chromium, nickel, and Aluminum; and, there is a percentage between the number of moles of each main metal element and the total number of moles of all elements, and the percentage is between 5% and 35%. As described in item 1 of the patent application scope, a welding method using alloy powder as a welding filler, wherein the alloy powder is a medium-entropy alloy powder composed of three to four main metal elements. The welding method using alloy powder as the welding filler as described in item 1 of the patent scope, wherein the step (1) includes the following detailed steps: (11) According to the materials of the first base material and the second base material Determine an elemental composition of the alloy powder; and (12) based on the elemental composition, mix powders of at least five metal elements into the alloy powder. The welding method using alloy powder as the welding filler as described in item 1 of the patent application scope, wherein in this step (4), an automatic powder feeder is used to fill the alloy powder into the joint groove , So that the filled alloy powder is held in front of the welding torch, so that the welding torch melts the alloy powder into the joining groove during the linear movement along the joining groove. The welding method using alloy powder as the welding filler as described in item 1 of the patent application scope, wherein the alloy powder can be wrapped in a thin metal tube to make a cored wire, and the cored wire After being directly output from the muzzle of the welding gun through a wire feeder, it is then melted by the welding gun, so that a molten metal of the cored welding wire is directly filled into the joining groove to form the welding seam. The welding method using alloy powder as the welding filler as described in item 1 of the patent application scope, wherein the following steps are further included between this step (5) and this step (6): a weld bead is formed in the joint groove After the bottom of the, remove the solder pad. A welding method using alloy powder as a welding filler as described in item 1 of the scope of the patent application, wherein a depression is formed in advance on the surface of the welding pad, and after the step (4) and the step (5) are completed A penetration portion of the weld is located between the recessed portion and the bottom of the joint groove. As described in Item 1 of the patent application scope, a welding method using alloy powder as a welding filler, wherein a gap is located between the bottom side of the first bonding surface and the bottom side of the second bonding surface. As described in Item 1 of the patent application scope, a welding method using alloy powder as a welding filler, wherein the first joining surface and the first joining surface are two mutually symmetrical surfaces. As described in item 1 of the patent application scope, a welding method using alloy powder as a welding filler, wherein the first joining surface and the first joining surface are two non-symmetrical surfaces. The welding method using alloy powder as the welding filler as described in item 1 of the patent application scope, wherein the welding gun has an inclination angle, and the inclination angle is between 20 ^o and 45 ^o ; and, the welding torch and a There is an angle between the normals, and the angle is between 70 ^o and 45 ^o . The welding method using alloy powder as the welding filler as described in item 1 of the scope of the patent application, wherein a gas supply device supplies a shielding gas to the joining groove through the welding gun; and, when the alloy powder is melted by the arc The shielding gas system prevents the molten alloy powder from being oxidized.

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