welding pen

Abstract

A welding pen is disclosed, comprising: a housing having a front end and a receiving cavity formed within the housing; a power unit disposed within the receiving cavity; and a welding head mounted on the front end of the housing, the welding head including a heating core electrically connected to the power unit and an outer sheath enclosing the heating core, wherein a portion of the welding head protrudes from the front end of the housing to form a welding tongue for welding. The welding pen has a relatively short heating distance so that the working area of ​​the welding pen can reach the required working temperature in a relatively short time after being activated.

Description

Technical Field

[0001] This application relates to hand tools, and more specifically to welding pens, wherein the welding pen has a relatively short thermal distance so that the working area of ​​the welding pen can reach the working temperature in a relatively short time after being activated. Background Technology

[0002] A soldering pen (also known as a soldering iron) is a common repair and machining tool, widely used in circuit repair, soldering of electronic components, and other fields. During operation, the soldering pen heats its tip via an electrically conductive heating element. Once the tip reaches a preset temperature, it melts solder onto the area to be soldered for the soldering process.

[0003] Existing welding pens include two types: internally heated welding pens and externally heated welding pens. Chinese Patent CN212682735U and US Patent US10646944B2 disclose the basic structure and principle of a common externally heated welding pen, which includes a heating tube and a cylindrical welding head embedded within the heating tube. A heating element is provided within the heating tube, configured to heat the welding head embedded within the heating tube from the outside in when it is turned on. US Patent US10722963B2 discloses the basic structure and principle of a common internally heated welding pen, which includes a cylindrical welding head and a heating component embedded within the cylindrical welding head. The heating component, when turned on, heats the end of the welding head from the inside out.

[0004] For any type of welding pen, startup speed is a crucial performance indicator. Here, startup speed refers to the time it takes for the welding tip to reach its operating temperature after the pen is powered on. The startup speed of a welding pen depends on: the heating power of the heating element, and the heat transfer efficiency between the heating element and the welding tip. More specifically, heat transfer efficiency depends on the distance between the working areas of the heating element and the welding tip, the contact area between them, and the thermal conductivity of the welding tip. Of these three factors, the distance between the working areas of the heating element and the welding tip is the most important. For ease of explanation, the distance between the heating element and the welding tip is defined as the thermal distance. It should be understood that in existing welding pens, the working area of ​​the welding tip is the tip itself; therefore, the thermal distance can be defined as the distance between the heating element and the tip of the welding tip.

[0005] Compared to externally heated welding pens, the heating element of internally heated welding pens is positioned closer to the tip of the welding head (i.e., internally heated welding pens have a relatively short heating distance). Therefore, compared to externally heated welding pens, internally heated welding pens have relatively higher heat conduction efficiency and relatively higher start-up speed.

[0006] However, since the working area of ​​a traditional internally heated welding pen is the tip of the welding head, the heating element cannot be directly placed at the tip. This is because the tip, as the working area, needs to have predetermined strength and rigidity. Placing the heating element at the tip would require a hollow structure, which would reduce the strength and rigidity of the welding head. In other words, for traditional internally heated welding pens, the technical approach of improving heat transfer efficiency by shortening the heat distance has a clear upper limit.

[0007] It should be noted that in existing internally heated welding pens, the heating element comprises a ceramic core and a resistance heating wire (as the heating element) wound around the ceramic core. To increase the heating power of the heating element, the ceramic core has a certain length within the welding head to allow for more turns of the resistance heating wire to be wound around it. That is, relative to the overall length of the welding head, the lengths of the ceramic core and the resistance heating wire are not negligible, causing some of the heat generated by the resistance heating wire during operation to dissipate along the non-working area of ​​the welding head, which reduces the start-up speed of the internally heated welding pen.

[0008] Furthermore, in existing internally heated soldering pens, due to the presence of the ceramic core (and in some internally heated soldering pens, a temperature sensor is also required inside the soldering head), the soldering head is configured as a cylinder, with its working area set at its tip. In actual operation, the tip working area can be used to melt solder and apply it to the area to be soldered. However, the tip working area limits the operational possibilities of the soldering pen; for example, it is not convenient to apply large areas of solder, and it cannot perform surface soldering.

[0009] Therefore, an optimized internal heating type welding pen is needed. Summary of the Invention

[0010] One advantage of this application is that it provides a welding pen in which the heating zone is closer to or located within the working area of ​​its welding head, thereby giving the welding pen a relatively shorter heating distance. This allows the working area of ​​the welding pen to reach the required working temperature in a relatively short time after activation. In other words, the welding pen has a relatively faster start-up speed; quantified, the start-up speed is within 6 seconds.

[0011] Another advantage of this application is that it provides a welding pen in which the working area of ​​the welding head has a flat structure to provide more operational possibilities. Specifically, the working area of ​​the welding head forms at least one operating line, at least one operating surface, and at least one operating tip to provide more diverse operational possibilities. For example, during operation, at least one operating line of the welding pen can be used as a hot cutting line to cut objects.

[0012] To achieve at least one of the above advantages or other advantages and objectives, according to one aspect of this application, a welding pen is provided, comprising:

[0013] A housing having a front end and a receiving cavity formed within the housing;

[0014] The power supply unit disposed within the receiving cavity; and

[0015] A welding head is installed at the front end of the housing, the welding head including a heating core electrically connected to the power supply unit and an outer skin covering the heating core, wherein a portion of the welding head protrudes from the front end of the housing to form a welding tongue for electric welding.

[0016] In the welding pen according to this application, the heating core is flat and the welding tongue is flat.

[0017] In the welding pen according to this application, the welding tongue includes a tongue body having at least one side edge, the at least one side edge forming at least one operating line for welding.

[0018] In the welding pen according to this application, the tongue has a first side and a second side that are parallel to each other, the first side forming a first operating line for welding, the second side forming a second operating line for welding, and the first operating line being parallel to the second operating line.

[0019] In the welding pen according to this application, the tongue has a first side surface located between the first side surface and the second side surface and a second side surface opposite to the first side surface, wherein at least a portion of the first side surface forms a first operating surface for welding and at least a portion of the second side surface forms a second operating surface for welding.

[0020] In the welding pen according to this application, the welding tongue includes a tip extending forward from the tongue body.

[0021] In the welding pen according to this application, the tip of the tongue has a rounded transition.

[0022] In the welding pen according to this application, the portion of the heating core and the outer skin that protrudes from the front end of the housing forms the welding tongue.

[0023] In the welding pen according to this application, the heating core includes a base layer, an insulating layer formed on the base layer, a heating layer formed on the insulating layer, and a lead wire electrically connected to the heating layer, wherein the lead wire is electrically connected to the power supply unit, so that the heating core is electrically connected to the power supply unit.

[0024] In the welding pen according to this application, the base layer has a front end and a rear end opposite to the front end, and the heating layer is formed on the insulating layer adjacent to the front end of the base layer, such that the heating layer is located at the front end of the welding tongue.

[0025] In the welding pen according to this application, the heating layer has a U-shaped structure.

[0026] In the welding pen according to this application, the heating core further includes a conductive layer extending from the front end of the base layer to its rear end, wherein the lead is electrically connected to the heating layer in such a way as to the rear end of the conductive layer.

[0027] In the welding pen according to this application, the heating core further includes a protective layer that covers at least a portion of the heating core.

[0028] In the welding pen according to this application, the base layer is made of a metallic material.

[0029] In the welding pen according to this application, the outer casing is made of a nickel alloy.

[0030] In the welding pen according to this application, the nickel alloy contains a nickel content of 40% or more.

[0031] In the welding pen according to this application, the heating core includes a base layer, an insulating layer formed on the base layer, a heating layer formed on the insulating layer, and a lead wire electrically connected to the heating layer, wherein the lead wire is electrically connected to the power supply unit, so that the heating core is electrically connected to the power supply unit.

[0032] In the welding pen according to this application, the base layer has a front end and a rear end opposite to the front end, and the heating layer is formed on the insulating layer adjacent to the front end of the base layer such that the heating layer is located at the tip of the welding tongue.

[0033] In the welding pen according to this application, the welding pen further includes a cap assembly that cooperates with the housing to cover the welding tongue, wherein the cap assembly includes at least one receiving cavity for receiving welding wire therein.

[0034] In the welding pen according to this application, the cap assembly further includes at least one convex lens.

[0035] The further objectives and advantages of this application will become fully apparent from the following description and accompanying drawings.

[0036] These and other objects, features and advantages of this application are fully apparent from the following detailed description, the accompanying drawings and the claims. Attached Figure Description

[0037] Figure 1 A perspective view of a soldering pen according to an embodiment of this application is shown.

[0038] Figure 2 The illustration shows a three-dimensional exploded view of the welding pen according to an embodiment of this application.

[0039] Figure 3 Another perspective view of the welding pen according to an embodiment of this application is shown.

[0040] Figure 4 The figure shows a perspective view of the welding head of the welding pen according to an embodiment of the present application.

[0041] Figure 5 The figure shows a cross-sectional schematic diagram of the welding head according to an embodiment of this application.

[0042] Figure 6A The figure shows a cross-sectional schematic diagram of the heating core of the welding head according to an embodiment of this application.

[0043] Figure 6B Another schematic diagram of the heating core of the welding head according to an embodiment of this application is shown.

[0044] Figure 6C The illustration shows another schematic diagram of the heating core of the welding head according to an embodiment of this application. Detailed Implementation

[0045] The following description is intended to disclose this application and enable those skilled in the art to implement it. The embodiments described below are merely examples, and other obvious variations will arise for those skilled in the art. The basic principles of this application defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of this application.

[0046] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0047] While ordinal numbers such as "first," "second," etc., will be used to describe various components, this does not limit which components are used. The term is used only to distinguish one component from another. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component, without departing from the teachings of the inventive concept. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0048] The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It will also be understood that the terms “comprising” and / or “having” as used in this specification specify the presence of the described features, numbers, steps, operations, components, elements or combinations thereof, without excluding the presence or addition of one or more other features, numbers, steps, operations, components, elements or groups thereof.

[0049] Exemplary welding pen

[0050] like Figures 1 to 3 As shown, an electric welding pen according to an embodiment of this application is illustrated, wherein the electric welding pen includes a housing 10, a power supply unit 20 disposed within the housing 10, and a welding head 30 protruding from the front end portion 101 of the housing 10 and electrically connected to the power supply unit 20, wherein the power supply unit 20 is configured to provide electrical energy required for the welding head 30 to operate.

[0051] Accordingly, in this embodiment, the power supply unit 20 is housed within the receiving cavity 100 formed by the housing 10. Specifically, as Figures 1 to 3 As shown, in this embodiment, the housing 10 includes an upper housing 11 and a lower housing 12 that engage with each other, wherein the receiving cavity 100 is formed between the engaging upper housing 11 and the lower housing 12. In this embodiment, the power unit 20 includes a circuit board 21 and a rechargeable battery 22 electrically connected to the circuit board 21, wherein the circuit board 21 is mounted within the receiving cavity 100 and extends from the rear end 102 of the housing 10 to the front end 101 of the housing 10. Accordingly, in this embodiment, the soldering head 30 is electrically connected to the rechargeable battery 22 in a manner electrically connected to the circuit board 21, so that the electrical energy provided by the rechargeable battery 22 can reach the soldering head 30 via the circuit board 21.

[0052] It is worth mentioning that, in this embodiment, the rechargeable battery 22 is a 3.6V rechargeable lithium battery. Furthermore, as... Figure 2 As shown, in this embodiment, the circuit board 21 includes a charging port 23, such as a Type-C interface, for charging the rechargeable battery 22.

[0053] like Figure 2 As shown, in this embodiment, the welding pen further includes a switch 24 disposed on the circuit board 21, wherein the switch is used to control the opening and closing circuit between the rechargeable battery 22 and the welding head 30, that is, the switch 24 can control whether the rechargeable battery 22 supplies power to the welding head 30. More specifically, as Figures 1 to 3 As shown, in this embodiment, the housing 10 further has a groove 103 recessed in the upper housing 11 and a slide switch 26 slidably mounted in the groove 103 to switch between a safe position and a working position. When in the safe position, the button 261 of the slide switch 26 is not aligned with the switch 24; therefore, even if the button 261 of the slide switch 26 is pressed, it cannot activate the switch 24 to turn on the power supply circuit between the rechargeable battery 22 and the welding head 30. When in the working position, the slide switch 26 moves along the groove 103... The slide 103 is slid downward so that the button 261 of the slide switch 103 corresponds to the switch 24. In this way, when the button 261 of the slide switch 26 is pressed, the button 261 actuates the switch 24 to turn on the power supply circuit between the rechargeable battery 22 and the welding head 30. Furthermore, when the button 261 of the slide switch 26 is not pressed, even if the slide switch 26 is in the working position, it will not turn on the power supply circuit between the rechargeable battery 22 and the welding head 30. In this way, the safety of the welding pen is improved.

[0054] like Figures 1 to 3 As shown, in this embodiment, the housing 10 further includes a mounting nozzle 13 and a nozzle sleeve 14 mounted on the front end portion 101 of the housing 10. The mounting nozzle 13 is engaged within an opening formed by the upper housing 11 and the lower housing 12, and the nozzle sleeve 14 is fitted over the mounting nozzle 13 to enclose it. Correspondingly, in this embodiment, the welding head 30 includes a head 31 and a welding tongue 32 extending forward from the head 31. The welding head 30 is protrudingly mounted on the front end portion 101 of the housing 10 such that its head 31 is fixed within the mounting nozzle 13 and its welding tongue 32 protrudes from the mounting nozzle 13 and the nozzle sleeve 14. That is, in this embodiment, the mounting nozzle 13 and the nozzle sleeve 14 form the front end portion 101 of the housing 10, and at least a portion of the welding head 30 protrudes from the front end portion 101 of the housing 10 to form the welding tongue 32. Specifically, in the embodiments of this application, the welding tongue 32 forms the working area of ​​the welding pen.

[0055] It is worth mentioning that, preferably, in this embodiment, the mounting nozzle 13 and the nozzle cover 14 are preferably made of a light-transmitting material, such as transparent plastic; and the welding pen further includes a light-emitting unit 25 electrically connected to the circuit board 21, wherein the light-emitting unit 25 is disposed at a specific position on the circuit board 21 so that when the light-emitting unit 25 is turned on, the light projected by the light-emitting unit 25 can pass through the mounting nozzle 13 and the nozzle cover 14 and illuminate the working area of ​​the welding tongue 32. In this way, when the welding pen is working in a dimly lit environment, the light-emitting unit 25 can provide supplementary lighting to the working area of ​​the welding pen, thereby improving the ease of operation of the welding pen. In this embodiment, the light-emitting unit 25 is mounted on the lower edge of the circuit board 21 and the light-emitting unit 25 corresponds to the working area of ​​the welding head 30. Through this positioning, the illumination area generated by the light-emitting unit 25 corresponds to the working area of ​​the welding head 30. In a specific example of this application, the light-emitting unit 25 is implemented as an LED lamp, and preferably, the LED lamp is a spotlight or the like.

[0056] like Figure 4 and Figure 5 As shown, in this embodiment, the welding head 30 includes a heating inner core 33 electrically connected to the power supply unit 20 and an outer skin 34 enclosing the heating inner core 33. The portion of the heating inner core 33 and the outer skin 34 protruding from the front end 101 of the housing 10 forms the welding tongue 32. Preferably, in this embodiment, there is no gap between the outer skin 34 and the heating inner core 33; that is, the outer skin 34 is tightly attached to the entire outer surface of the heating inner core 33. This allows the heat generated by the heating inner core 33 to be effectively and efficiently conducted to the surface of the outer skin 34. In this embodiment, the outer skin 34 is preferably made of a high-temperature resistant and oxidation-resistant material. In a specific example of this application, the outer skin 34 is made of a nickel alloy, for example, a nickel-iron alloy, wherein the nickel content in the nickel alloy is greater than or equal to 40%.

[0057] It should be noted that the heating core 33 is flat, and the outer skin 34 is shaped like the heating element. It is squeezed and adhered to the entire outer surface of the heating core 33. Therefore, the welding tongue 32 of the welding head 30, which protrudes from the front end 101 of the housing 10, also has a flat structure. This structural configuration makes the welding pen more operational.

[0058] Specifically, such as Figure 3 and Figure 4As shown, in this embodiment, the welding tongue 32 includes a tongue body 321 and a tongue tip 322 extending forward from the tongue body 321. The tongue body 321 has at least one side edge, which forms at least one operating line for welding. During operation, the at least one operating line can be used as a thermal cutting line to cut objects, such as foam. More specifically, in this embodiment, the tongue body 321 has a first side edge and a second side edge that are parallel to each other. The first side edge forms a first operating line 323 for welding, and the second side edge forms a second operating line 324 for welding. The first operating line 323 and the second operating line 324 are parallel to each other.

[0059] Furthermore, such as Figure 3 and Figure 4 As shown, in this embodiment, the tongue 321 has a first side surface located between the first side surface and the second side surface, and a second side surface opposite to the first side surface. At least a portion of the first side surface forms a first operating surface 325 for welding, and at least a portion of the second side surface forms a second operating surface 326 for welding. During operation, the first operating surface 325 and / or the second operating surface 326 can be used as a hot-welding surface to increase the welding area and / or improve the efficiency of solder coating.

[0060] And, as Figure 3 and Figure 4 As shown, in this embodiment, the tip 322 extending forward from the tongue body 321 forms the operating tip 327 of the soldering pen. During operation, the operating tip 327 can be used to melt solder wire, apply solder, etc. Although, in cases such as Figure 2 In the illustrated example, the tongue tip 322 has a V-shaped structure, but those skilled in the art should understand that, in order to improve the operational safety of the welding pen, the tip of the tongue tip 322 may adopt a rounded transition in other examples of this application.

[0061] More specifically, in this embodiment, the heating core 33 is an electronic component used to achieve the heating function, manufactured on a metal substrate using thick-film circuit technology and screen printing process. Specifically, as... Figures 6A to 6C As shown, in this embodiment, the heating core 33 includes a base layer 331, an insulating layer 332 formed on the base layer 331, a heating layer 333 formed on the insulating layer 332, and a lead 334 electrically connected to the heating layer 333. The lead 334 is electrically connected to the power supply unit 20, so that the heating core 33 is electrically connected to the power supply unit 20.

[0062] Specifically, in this embodiment, the base layer 331 is made of a metallic material, such as stainless steel. The insulating layer 332 is made of an insulating medium, such as ceramic. The heating layer 333 is formed by curing a resistive paste through a screen printing process. It should be understood that the heating layer 333 forms the heating area of ​​the soldering pen. Therefore, in this embodiment, the heating distance of the soldering pen can be adjusted by adjusting the placement of the heating layer 333 on the base layer 331, that is, adjusting the distance between the heating area and the working area of ​​the soldering pen.

[0063] Preferably, in this embodiment of the application, the base layer 331 has a front end and a rear end opposite to the front end, wherein the heating layer 333 is formed on the insulating layer 332 adjacent to the front end of the base layer 331. This positional configuration makes the heating area and the working area of ​​the welding pen as close as possible, so that the heat provided by the heating area can be transferred to the working area with the shortest distance, thereby improving the heat conduction efficiency and thus improving the start-up time of the welding pen.

[0064] More specifically, in this embodiment, when the heating layer 333 is disposed at the front end of the base layer 331, the heating area of ​​the welding pen is located at the tip 322 of the welding tongue 32. Thus, the heat generated by the heating layer 333 can directly act on the tip 322 of the welding tongue 32, thereby increasing the rate of temperature rise of the tip 322. More preferably, in this embodiment, the heating layer 333 has a certain length, so that the working area formed by the heating layer 333 can further extend and cover at least a portion of the tongue 321 of the welding tongue 32, thereby increasing the rate of temperature rise of the operating line and the operating surface.

[0065] When the heating layer 333 is disposed at the front end of the base layer 331, in order to form a current loop, such as Figures 6A to 6C As shown, in this embodiment, the heating core 33 further includes a conductive layer 335 extending from the front end of the base layer 331 to its rear end. The lead 334 is electrically connected to the heating layer 333 in a manner that connects it to the rear end 102 of the conductive layer 335. Thus, the electrical energy provided by the rechargeable battery 22 can pass through the circuit board 21, the lead 334, and the conductive layer 335, and ultimately act on the heating layer 333. Here, the conductive layer 335 is made of a material with good electrical conductivity, such as Au, Cu, Al, etc.

[0066] To protect the heating layer 333, in some examples of this application, the heating core 33 further includes a protective layer 336 covering at least a portion of the outer surface of the heating core 33. Here, the protective layer 336 may be made of glass material, such as a glass protective glaze. Preferably, in this embodiment, the protective layer 36 does not cover the heating layer 333, or only covers a small portion of the heating layer 336, so that the heat generated by the heating layer 333 is not blocked by the protective layer 336, thereby improving heat conduction efficiency. That is, in the embodiments of this application, most of the heating layer 333 is directly attached to the outer skin 34, so that the heat generated by the heating layer 333 can be directly conducted to the outer skin 34, thereby increasing the heating rate of the outer skin 34.

[0067] It is worth mentioning that, in this embodiment, the resistance of the resistive paste in the heating layer 333 is linearly related to its operating temperature, more specifically, it is linearly positively correlated; that is, the higher the temperature of the heating layer 333, the greater its resistance. Based on this material characteristic, in this embodiment, the welding pen can perform temperature control based on the resistance change of the heating layer 333 without the need for a temperature sensor. This is also one of the reasons why the working area of ​​the welding pen can be configured to be flat.

[0068] like Figures 1 to 3 As shown, in this embodiment of the application, to improve the convenience of the welding pen, the welding pen further includes a cap assembly 40 that cooperates with the housing 10 to cover the welding tongue 32. It should be understood that when the welding tongue 32 is covered within the cap assembly 40, the welding tongue 32 can be well protected.

[0069] Furthermore, in this embodiment, the cap assembly 40 includes at least one receiving cavity 400 for receiving the welding wire 50 therein. That is, in this embodiment, the welding wire 50 can be installed in the receiving cavity 400 formed by the cap assembly 40, so that when the welding wire 50 is needed, it can be directly taken out from the receiving cavity 400 for welding operations without having to temporarily search for a usable welding wire 50.

[0070] More specifically, in this embodiment, the cap assembly 40 includes a pen cap 41 and a sleeve 42, wherein the pen cap 41 is sleeved on the front end portion 101 of the housing 10 to accommodate the welding tongue 32 within the space formed by the pen cap 41 and the front end portion 101 of the housing 10. Figure 1 and Figure 2As shown, in this embodiment, the sleeve 42 has a hollow structure to form a receiving cavity 400 for receiving the welding wire 50. When the welding wire 50 is coiled and received in the receiving cavity 400, the sleeve 42 can be further sleeved onto the end of the pen cap 41 to further improve the portability of the welding pen.

[0071] like Figures 1 to 3 As shown, in this embodiment, the pen cap 41 includes a pen cap body 411 and a first extension arm 412 extending upward from the pen cap body 411. It should be noted that when the pen cap 41 is engaged with the front end 101 of the housing 10, the first extension arm 412 of the pen cap 41 engages with the sliding switch 26, thereby holding the sliding switch 26 in a safe position. That is, in this embodiment, the first extension arm 412 of the pen cap 41 forms a locking mechanism for locking the sliding switch 26, effectively preventing the sliding switch 26 from accidentally sliding down to its working position. This further enhances the safety of the soldering pen. For example, when the soldering pen is stored in a pocket, the first extension arm 41 of the pen cap can effectively prevent the sliding switch 26 of the soldering pen from accidentally sliding down to its working position, ensuring that the soldering pen is not misoperated. This also improves the portability of the soldering pen.

[0072] like Figures 1 to 3 As shown, in this embodiment, the pen cap 41 further includes a second extension arm 413 extending upward from the pen cap body 311 and relative to the first extension arm 412, wherein the free end of the second extension arm forms a convex lens 410. It should be understood that during operation, the at least one convex lens 410 can be used as a magnifying glass to further improve the ease of operation of the soldering pen.

[0073] In summary, the welding pen based on the embodiments of this application is explained, wherein the welding pen has a relatively faster start-up speed, quantified to be within 6 seconds. Furthermore, the working area of ​​the welding head 30 has a flat structure to provide more operational possibilities.

[0074] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any variations or modifications may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A welding pen, characterized in that, include: A housing having a front end and a receiving cavity formed within the housing; A power supply unit disposed within the receiving cavity; as well as A welding head is installed at the front end of the housing, the welding head including a heating core electrically connected to the power supply unit and an outer skin covering the heating core, wherein a portion of the welding head protrudes from the front end of the housing to form a welding tongue for electric welding; The heating core includes a base layer, an insulating layer formed on the base layer, a heating layer formed on the insulating layer, and a lead wire electrically connected to the heating layer, wherein the lead wire is electrically connected to the power supply unit, so that the heating core is electrically connected to the power supply unit. The welding tongue includes a tongue body having at least one side edge forming at least one operating line for welding; the welding tongue includes a tip extending forward from the tongue body; the base layer has a front end portion and a rear end portion opposite to the front end portion; the heating layer is formed on the insulating layer adjacent to the front end portion of the base layer, such that the heating layer is located at the front end portion or the tip of the welding tongue; The heating core further includes a conductive layer extending from the front end of the base layer to its rear end, wherein the lead wire is electrically connected to the heating layer in such a way as to the rear end of the conductive layer.

2. The welding pen according to claim 1, wherein, The heating core is flat, and the welding tongue is flat.

3. The welding pen according to claim 1, wherein, The tongue has a first side and a second side that are parallel to each other. The first side forms a first operating line for electric welding, and the second side forms a second operating line for electric welding. The first operating line and the second operating line are parallel.

4. The welding pen according to claim 3, wherein, The tongue has a first side surface located between the first side surface and the second side surface and a second side surface opposite to the first side surface, wherein at least a portion of the first side surface forms a first operating surface for electric welding and at least a portion of the second side surface forms a second operating surface for electric welding.

5. The welding pen according to claim 1, wherein, The tip of the tongue is rounded.

6. The welding pen according to claim 2, wherein, The portion of the heating inner core and the outer skin that protrudes from the front end of the housing forms the welding tongue.

7. The welding pen according to claim 1, wherein, The heating layer has a U-shaped structure.

8. The welding pen according to claim 7, wherein, The heating core further includes a protective layer that covers at least a portion of the heating core.

9. The welding pen according to claim 1, wherein, The base layer is made of metallic material.

10. The welding pen according to claim 1, wherein, The outer skin is made of a nickel alloy.

11. The welding pen according to claim 10, wherein, The nickel alloy contains at least 40% nickel.

12. The welding pen according to claim 1, wherein, The welding pen further includes a cap assembly that cooperates with the housing to cover the welding tongue, wherein the cap assembly includes at least one receiving cavity for receiving welding wire therein.

13. The welding pen according to claim 12, wherein, The cap assembly also includes at least one convex lens.

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