CN215919357U - Electric welding pen - Google Patents

Abstract

Disclosed is an electric welding pen, wherein the electric welding pen comprises: a housing having a front end portion and an accommodating chamber formed in the housing; a power supply unit disposed in the housing chamber; and the welding head is arranged at the front end part of the shell and comprises a heating inner core electrically connected to the power supply unit and an outer skin wrapping the heating inner core, wherein one part of the welding head protrudes out of the front end part of the shell to form a welding tongue for electric welding. The welding pen has a relatively short thermal distance so that the working area of the welding pen can reach the temperature required for working in a relatively short time after being started.

Description

Electric welding pen

Technical Field

The present application relates to hand tools and, more particularly, to an electric welding pen having a relatively short thermal distance to enable a working area of the electric welding pen to reach a desired working temperature in a relatively short time after being activated.

Background

An electric welding pen (also called electric iron) is a common maintenance tool, and is widely applied to the fields of circuit maintenance, welding processing of electronic components and the like. In the working process, the electric welding pen heats the welding head of the electric welding pen through the electric conduction heating element, wherein after the welding head is heated to the preset temperature, the electric welding pen can be used for melting soldering tin at the welded position to perform welding processing.

Existing soldering pens include two types: an internal thermal electric welding pen and an external thermal electric welding pen. Chinese patent CN 212682735U and US10646944B2 disclose the basic structure and principle of a common external heating type electric welding pen, which includes a heating tube and a cylindrical welding head embedded in the heating tube, wherein a heating element is disposed in the heating tube, and the heating element is configured to heat the welding head embedded in the heating tube from outside to inside after being conducted. US10722963B2 discloses the basic structure and principle of a conventional internal heat type electric welding pen, which comprises a cylindrical welding head and a heating element embedded in the cylindrical welding head, wherein the heating element is used for heating the end of the welding head from inside to outside after being conducted.

Regardless of the type of welding pen, the starting speed is one of the very important indicators, and here, the starting speed refers to the time when the welding pen reaches the working temperature after being powered on. The starting speed of the welding pen depends on: the heating power of the heating element, and the efficiency of heat conduction between the heating element and the bonding head. More finely, the efficiency of heat conduction depends on the distance between the heating element and the working area of the bonding tool, the contact area between the heating element and the bonding tool, and the thermal conductivity of the bonding tool, with the most important of these three factors being the distance between the heating element and the working area of the bonding tool. For convenience of explanation, the distance between the heating element and the horn is defined as the thermal distance. It should be appreciated that in existing electrowelding pens, the working area of the bonding tool is the tip of the bonding tool, and thus, the thermal distance may be defined as the distance between the heating element and the tip of the bonding tool.

Compared with an external thermal electric welding pen, the heating component of the internal thermal electric welding pen is arranged more adjacent to the tip of the welding head (i.e., the internal thermal electric welding pen has a relatively short thermal distance), so that the internal thermal electric welding pen has relatively high heat conduction efficiency and relatively high starting speed compared with the external thermal electric welding pen.

However, since the working area of the conventional internal heating type electric welding pen is the tip portion of the bonding tool, the heat generating component cannot be directly disposed at the tip portion of the bonding tool, because: the tip portion of the horn, which is the work area, needs to have a predetermined strength and rigidity, which means that the tip portion of the horn needs to have a hollow structure if the heat generating component is to be disposed at the tip portion of the horn, which may reduce the strength and rigidity of the horn. That is, there is a clear upper limit to the technical route of improving the heat conduction efficiency by shortening the heat distance for the conventional internal heat type electric welding pen.

It should be noted that in the existing internal heating type electric welding pen, the heating element includes a ceramic core and a resistance hot wire (as a heating element) wound around the ceramic core. In order to improve the heating power of the heating element, the ceramic inner core has a certain length in the welding head so as to wind more circles of resistance heating wires on the ceramic inner core. That is, the ceramic core and the resistance wire are of non-negligible length relative to the overall length of the bonding tool, resulting in a portion of the heat generated by the resistance wire being dissipated along the non-working area of the bonding tool during operation, which reduces the actuation speed of the internally heated electrowelding pen.

Further, in the existing internal heat type electric welding pens, due to the existence of the ceramic core (in some internal heat type electric welding pens, it is also necessary to provide a temperature sensor inside the horn), the horn is configured in a cylindrical shape, and its working area is set as its tip end portion. In practice, the tip working area can be used to melt and apply solder to the place to be soldered, but the tip working area limits the possibilities of handling the electric welding pen, e.g. the tip working area does not facilitate the application of large areas of solder, the tip working area cannot be surface soldered, etc.

Therefore, there is a need for an optimized internal thermal welding pen.

Disclosure of Invention

One advantage of the present application is that it provides an electric welding pen in which the heat generating zone of the electric welding pen is located closer to or at the working zone of its welding head, so that the electric welding pen has a relatively shorter thermal distance, so that the working zone of the electric welding pen can reach the temperature required for operation in a relatively shorter time after being activated. That is, the welding pen has a relatively faster start-up speed, quantified as the start-up speed of the welding pen is within 6 s.

Another advantage of the present application is to provide an electric welding pen wherein the working area of the welding head has a flat configuration to provide more operational possibilities. In particular, the working area of the welding head forms at least one operating line, at least one operating surface and at least one operating tip, in order to provide a greater diversity of operating possibilities. For example, during operation, at least one wire of the welding pen may be used as a thermal cut line to cut the object.

To achieve at least one of the above advantages or other advantages and objects, according to one aspect of the present application, there is provided an electric welding pen including:

a housing having a front end portion and an accommodating chamber formed in the housing;

a power supply unit disposed in the housing chamber; and

and the welding head is arranged at the front end part of the shell and comprises a heating inner core electrically connected to the power supply unit and an outer skin wrapping the heating inner core, wherein one part of the welding head protrudes out of the front end part of the shell to form a welding tongue for electric welding.

In an electric welding pen according to the present application, the heat-generating core has a flat shape, and the solder tab has a flat shape.

In an electric welding pen according to the application, the welding tongue comprises a tongue body having at least one side forming at least one operating wire for electric welding.

In the electric welding pen according to the application, the tongue body has first side and second side that are parallel to each other, first side forms the first operating line that is used for electric welding, the second side forms the second operating line that is used for electric welding, first operating line with the second operating line is parallel.

In an electric welding pen according to the application, the tongue has a first side located between the first side and the second side and a second side opposite to the first side, wherein at least a part of the first side forms a first operating surface for electric welding and at least a part of the second side forms a second operating surface for electric welding.

In an electric welding pen according to the present application, the welding tongue comprises a tongue tip extending forward from the tongue body.

In the electric welding pen according to the application, the tip of the tongue tip adopts a circular arc transition.

In the electric welding pen according to the present application, the portions of the heat-generating inner core and the outer sheath that protrude out of the front end portion of the housing form the weld tongues.

In the electric welding pen according to the application, the heat generating inner core comprises a base layer, an insulating layer formed on the base layer, a heat generating layer formed on the insulating layer, and a lead electrically connected to the heat generating layer, wherein the lead is electrically connected to the power supply unit, so that the heat generating inner core is electrically connected to the power supply unit.

In the electric welding pen according to the present application, the base layer has a front end portion and a rear end portion opposite to the front end portion, and the heat generating layer is formed at a position of the insulating layer adjacent to the front end portion of the base layer so that the heat generating layer is located at the front end portion of the tab.

In an electric welding pen according to the application, the heat generating layer has a U-shaped structure.

In the electric welding pen according to the present application, the heat generating core further includes a conductive layer extending from a front end portion to a rear end portion of the base layer, wherein the lead is electrically connected to the heat generating layer in such a manner as to be electrically connected to the rear end portion of the conductive layer.

In an electric welding pen according to the present application, the heat-generating core further includes a protective layer covering at least a part of the heat-generating core.

In an electric welding pen according to the application, the base layer is made of a metal material.

In the electric welding pen according to the present application, the sheath is made of a nickel alloy.

In the electric welding pen according to the present application, the proportion of nickel in the nickel alloy is 40% or more.

In the electric welding pen according to the application, the heat generating inner core comprises a base layer, an insulating layer formed on the base layer, a heat generating layer formed on the insulating layer, and a lead electrically connected to the heat generating layer, wherein the lead is electrically connected to the power supply unit, so that the heat generating inner core is electrically connected to the power supply unit.

In the electric welding pen according to the present application, the base layer has a front end portion and a rear end portion opposite to the front end portion, and the heat generating layer is formed at a position of the insulating layer adjacent to the front end portion of the base layer so that the heat generating layer is located at a tongue tip of the welding tongue.

In an electric welding pen according to the present application, the electric welding pen further includes a cap assembly cooperating with the housing to cover the welding tongue, wherein the cap assembly includes at least one receiving cavity for receiving a welding wire therein.

In an electric welding pen according to the present application, the cap assembly further includes at least one convex lens.

Further objects and advantages of the present application will become apparent from an understanding of the ensuing description and drawings.

These and other objects, features and advantages of the present application will become more fully apparent from the following detailed description, the accompanying drawings and the claims.

Drawings

FIG. 1 shows a perspective view of an electrical welding pen according to an embodiment of the present application.

FIG. 2 illustrates a perspective exploded view of the electrical welding pen according to an embodiment of the present application.

FIG. 3 illustrates another perspective view of the electrical welding pen according to an embodiment of the present application.

Fig. 4 illustrates a perspective view of a welding head of the electrowelding pen according to an embodiment of the present application.

Fig. 5 illustrates a schematic cross-sectional view of the weld head according to an embodiment of the present application.

Fig. 6A illustrates a schematic cross-sectional view of a heat-generating core of the bonding tool according to an embodiment of the present application.

Fig. 6B illustrates another schematic view of the heat-generating core of the horn according to an embodiment of the present application.

Fig. 6C illustrates yet another schematic view of the heat-generating core of the bonding tool according to an embodiment of the present application.

Detailed Description

The following description is presented to disclose the application and to enable any person skilled in the art to practice the application. The embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The underlying principles of the application, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the application.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

While ordinal numbers such as "first," "second," etc., will be used to describe various components, those components are not limited herein. The term is used only to distinguish one element from another. For example, a first component could be termed a second component, and, similarly, a second component could be termed a first component, without departing from the teachings of the present inventive concept. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

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 forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, numbers, steps, operations, components, elements, or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, elements, or groups thereof.

Exemplary electric welding pen

As shown in fig. 1 to 3, an electric welding pen according to an embodiment of the present application is illustrated, wherein the electric welding pen includes a housing 10, a power supply unit 20 disposed in the housing 10, and a welding head 30 protruding from a front end 101 of the housing 10 and electrically connected to the power supply unit 20, wherein the power supply unit 20 is configured to provide electric power required for operation of the welding head 30.

Accordingly, in this embodiment, the power supply unit 20 is accommodated in the accommodating cavity 100 formed by the housing 10. Specifically, as shown in fig. 1 to 3, in this embodiment, the housing 10 includes an upper housing 11 and a lower housing 12 that are engaged with each other, wherein the receiving cavity 100 is formed between the upper housing 11 and the lower housing 12 that are engaged with each other. In this embodiment, the power supply 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 in the receiving cavity 100 and extends from a rear end 102 of the housing 10 to a front end 101 of the housing 10. Accordingly, in this embodiment, the bonding tool 30 is electrically connected to the rechargeable battery 22 in such a manner that it is electrically connected to the circuit board 21, so that the electric power provided by the rechargeable battery 22 can reach the bonding tool 30 through the circuit board 21.

It is worth mentioning that, in this embodiment, the rechargeable battery 22 is a rechargeable lithium battery with a voltage of 3.6V. Also, as shown in fig. 2, in this embodiment, the circuit board 21 includes a charging port 23, for example, a Type-C interface, for charging the rechargeable battery 22.

In this embodiment, as shown in fig. 2, the electric welding pen further comprises a switch 24 disposed on the circuit board 21, wherein the switch is used for controlling the open 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 shown in fig. 1 to 3, in this embodiment, the housing 10 further has a slide groove 103 concavely formed in the upper housing 11 and a slide switch 26 slidably mounted in the slide groove 103 to switch between a safety position and an operating position, wherein, when in the safety position, a button 261 of the slide switch 26 is not aligned with the switch 24, and therefore, even if the button 261 of the slide switch 26 is pressed, it cannot act on the switch 24 to open the power supply circuit between the rechargeable battery 22 and the welding head 30; and when in the working position, the slide switch 26 is slid downward along the slide groove 103 so that the button 261 of the slide switch 103 corresponds to the switch 24, so that when the button 261 of the slide switch 26 is pressed, the button 261 operates the switch 24 to open the power supply circuit between the rechargeable battery 22 and the welding head 30, and when the button 261 of the slide switch 26 is not pressed, even if the slide switch 26 is in the working position, it does not open the power supply circuit between the rechargeable battery 22 and the welding head 30, in such a way that the safety of the electric welding pen is improved.

As shown in fig. 1 to 3, in this embodiment, the housing 10 further includes a mounting nozzle 13 and a nozzle sleeve 14 mounted on the front end 101 of the housing 10, wherein the mounting nozzle 13 is engaged in the opening formed by the upper housing 11 and the lower housing 12, and the nozzle sleeve 14 is sleeved outside the mounting nozzle 13 to enclose the mounting nozzle 13 therein. Accordingly, in this embodiment, the welding head 30 includes a head portion 31 and a weld tongue 32 extending forward from the head portion 31, wherein the welding head 30 is protrudingly mounted to the front end portion 101 of the housing 10 in such a manner that the head portion 31 thereof is fixed in the mounting nozzle 13 and the weld tongue 32 thereof protrudes from the mounting nozzle 13 and the plug shroud 14. That is, in the present embodiment, the mounting nozzle 13 and the plug wrap 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 weld tongue 32. In particular, in the present embodiment, the solder tab 32 forms the working area of the electrical soldering pen.

It is worth mentioning that, preferably, in the present embodiment, the mounting mouth 13 and the plug wrap 14 are preferably made of a light permeable material, for example, a transparent plastic; moreover, the electric welding pen further comprises a light-emitting unit 25 electrically connected to the circuit board 21, wherein the light-emitting unit 25 is disposed at a specific position of the circuit board 21, so that when the light-emitting unit 25 is turned on, light projected by the light-emitting unit 25 can pass through the mounting nozzle 13 and the nozzle sleeve 14 and illuminate a working area of the welding tongue 32, and thus when the electric welding pen works in a dark environment, the light-emitting unit 25 can supplement light for the working area of the electric welding pen, so as to improve the operation convenience of the electric welding pen. In this embodiment, the light emitting unit 25 is mounted on the lower edge of the wiring board 21 and the light emitting unit 25 corresponds to the working area of the soldering tip 30, and the position is set so that the light irradiation area generated by the light emitting unit 25 corresponds to the working area of the soldering tip 30. In one specific example of the present application, the light emitting unit 25 is implemented as an LED lamp, and preferably, the LED lamp is a spotlight or the like.

As shown in fig. 4 and 5, in this embodiment, the welding head 30 includes a heat generating core 33 electrically connected to the power supply unit 20 and an outer skin 34 wrapping the heat generating core 33, wherein portions of the heat generating core 33 and the outer skin 34 protruding from the front end portion 101 of the housing 10 form the weld tongues 32. Preferably, in this embodiment, there is no gap between the outer skin 34 and the heat generating core 33, that is, the outer skin 34 is closely attached to the entire outer surface of the heat generating core 33, so that the heat generated by the heat generating core 33 can be efficiently and effectively conducted to the surface of the outer skin 34. In this embodiment, the skin 34 is preferably made of a material that is resistant to high temperatures and oxidation. In one particular example of the present application, skin 34 is made of a nickel alloy, such as a nickel-iron alloy, wherein the proportion of nickel in the nickel alloy is greater than or equal to 40%.

It should be noted in particular that the heat-generating core 33 has a flat shape, and the sheath 34, which is shaped in conformity with the heat-generating sheet, is pressed and attached to the entire outer surface of the heat-generating core 33, so that the tab 32 of the soldering tip 30 protruding from the front end 101 of the housing 10 also has a flat configuration, by which configuration the electric soldering pen has more handling possibilities.

Specifically, as shown in fig. 3 and 4, in this embodiment, the welding tongue 32 includes a tongue body 321 and a tongue tip 322 extending forward from the tongue body 321, wherein the tongue body 321 has at least one side edge, and the at least one side edge forms at least one operation line for electric welding. During operation, the at least one operating wire may be used as a hot cut line to cut objects, such as foam and the like. More specifically, in this embodiment, the tongue 321 has a first side and a second side parallel to each other, the first side forms a first operating wire 323 for electric welding, the second side forms a second operating wire 324 for electric welding, and the first operating wire 323 is parallel to the second operating wire 324.

Further, as shown in fig. 3 and 4, in this embodiment, the tongue body 321 has a first side surface located between the first side edge and the second side edge, and a second side surface opposite to the first side surface, wherein at least a portion of the first side surface forms a first operation surface 325 for electric welding, and at least a portion of the second side surface forms a second operation surface 326 for electric welding. During operation, the first operation surface 325 and/or the second operation surface 326 may be used as a thermal welding surface for increasing the welding area and/or the efficiency of applying solder.

Also, as shown in fig. 3 and 4, in this embodiment, the tongue tip 322 extending forward from the tongue body 321 forms an operating tip 327 of the electric welding pen, wherein the operating tip 327 can be used to melt welding wire, apply solder, and the like during operation. Although, in the example illustrated in fig. 2, the tongue tip 322 has a V-shaped configuration, it will be appreciated by those skilled in the art that, in other examples of the present application, the tip of the tongue tip 322 may have a rounded transition in order to improve the operational safety of the electric welding pen.

More specifically, in this embodiment, the heat generating core 33 is an electronic component manufactured on a metal base layer by using a thick film circuit technology principle and a screen printing process to realize a heat generating function. Specifically, as shown in fig. 6A to 6C, in this embodiment, the heat generating core 33 includes a base layer 331, an insulating layer 332 formed on the base layer 331, a heat generating layer 333 formed on the insulating layer 332, and a lead 334 electrically connected to the heat generating layer 333, wherein the lead 334 is electrically connected to the power supply unit 20, so that the heat generating core 33 is electrically connected to the power supply unit 20.

In particular, in this embodiment, the base layer 331 is made of a metal material, for example, a stainless steel material. The insulating layer 332 is made of an insulating medium, for example, ceramic or the like. The heat generating layer 333 is formed by curing a resistance paste through a screen printing process. It should be understood that the heat generating layer 333 forms a heat generating region of the electric welding pen, and therefore, in the embodiment of the present application, the heat distance of the electric welding pen, i.e., the distance between the heat generating region and the working region of the electric welding pen, can be adjusted by adjusting the layout position of the heat generating layer 333 on the substrate layer 331.

Preferably, in the embodiment of the present application, the base layer 331 has a front end portion and a rear end portion opposite to the front end portion, wherein the heat generating layer 333 is formed at a position of the insulating layer 332 adjacent to the front end portion of the base layer 331, and the position configuration is such that the heat generating region and the working region of the electric welding pen are as close as possible, so that the heat supplied from the heat generating region can be transferred to the working region at the shortest distance to improve the heat conduction efficiency and thus the start time of the electric welding pen.

More specifically, in the embodiment of the present application, when the heat generating layer 333 is disposed at the front end portion of the substrate layer 331, the heat generating region of the electric welding pen is located at the tongue tip 322 of the welding tongue 32, so that the heat generated by the heat generating layer 333 can be directly applied to the tongue tip 322 of the welding tongue 32 to increase the speed of temperature rise of the tongue tip 322. More preferably, in the embodiment of the present application, the heat generating layer 333 has a length dimension such that the working area formed by the heat generating layer 333 can further extend and cover at least a portion of the tongue body 321 of the soldering tongue 32 to increase the temperature rising speed of the operating wire and the operating surface. For example, in the example illustrated in fig. 6C, the heat generation layer 333 has a U structure that is located at the tongue tip 322 of the solder tongue 32 and covers at least a part of the tongue body 321 of the solder tongue 32.

When the heat generating layer 333 is provided at the front end portion of the base layer 331, in order to form a current loop, as shown in fig. 6A to 6C, in this embodiment, the heat generating core 33 further includes a conductive layer 335 extending from the front end portion to the rear end portion of the base layer 331, wherein the lead wire 334 is electrically connected to the heat generating layer 333 so as to be electrically connected to the rear end portion 102 of the conductive layer 335. Thus, the electric energy supplied via the rechargeable battery 22 can pass through the wiring board 21, the lead 334, and the conductive layer 335, and finally act on the heat generating layer 333. Here, the conductive layer 335 is made of a material having good conductivity, for example, Au, Cu, Al, or the like.

In order to provide protection to the heat generating layer 333, in some examples herein, the heat generating core 33 further includes a protective layer 336 covering at least a portion of an outer surface of the heat generating core 33. Here, the protective layer 336 may be made of a glass material, for example, a glass protective glaze. Preferably, in this embodiment, the protection layer 36 does not cover the heat generating layer 333, or only covers a small portion of the heat generating layer 336, so that heat generated by the heat generating layer 333 is not blocked by the protection layer 336 to improve heat conduction efficiency. That is, in the embodiment of the present invention, most of the heat generating layer 333 is directly attached to the outer skin 34, so that the heat generated by the heat generating layer 333 can be directly conducted to the outer skin 34, thereby increasing the temperature rising speed of the outer skin 34.

It is worth mentioning that, in the embodiment of the present application, the resistance value of the resistance paste of the heat generating layer 333 is in a linear relationship with the operating temperature thereof, and more specifically, in a linear positive correlation, that is, the higher the temperature of the heat generating layer 333 is, the larger the resistance value thereof is. Based on this material property, in the embodiment of the present application, the electric welding pen can perform temperature control based on the resistance value change of the heat generating layer 333 without configuring a temperature sensor, which is one of the reasons why the working area of the electric welding pen can be configured flat.

As illustrated in fig. 1 to 3, in the embodiment of the present application, in order to improve the convenience of the electric welding pen, the electric welding pen further includes a cap assembly 40 that cooperates with the housing 10 to cover the weld tongue 32. It should be appreciated that when the weld tab 32 is encased within the cap assembly 40, the weld tab 32 is well protected.

Further, in this embodiment, the cap assembly 40 includes at least one receiving cavity 400, and the at least one receiving cavity 400 is used for receiving the welding wire 50 therein. That is, in the embodiment of the present application, 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, the welding wire 50 can be directly taken out from the receiving cavity 400 for electric welding operation without temporarily searching for the available welding wire 50.

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 101 of the housing 10 to accommodate the solder tabs 32 in a space formed by the pen cap 41 and the front end 101 of the housing 10. As shown in fig. 1 and 2, in this embodiment, the sleeve 42 has a hollow structure to form a receiving cavity 400 for receiving the welding wire 50, wherein when the welding wire 50 is curled and received in the receiving cavity 400, the sleeve 42 can be further sleeved on the end of the cap 41 to further improve the portability of the electric welding pen.

As shown in fig. 1 to 3, in this embodiment, the cap 41 includes a cap main body 411 and a first extension arm 412 extending upward from the cap main body 411, wherein it should be noted that, when the cap 41 is snapped onto the front end 101 of the housing 10, the first extension arm 412 of the cap 41 is snapped onto the slide switch 26, so that the slide switch 26 is kept in a safe position. That is, in the present embodiment, the first extension arm 412 of the cap 41 forms a locking mechanism for locking the slide switch 26 to effectively prevent the slide switch 26 from being mistakenly slid down to its working position, in such a way as to further enhance the safety of the electric welding pen. For example, when the welding pen is stored in a pocket, the first extension arm 41 of the cap can effectively prevent the slide switch 26 of the welding pen from being mistakenly slid down to the working position thereof, so as to ensure that the welding pen is not mistakenly operated, and thus, the portability of the welding pen can be improved.

In this embodiment, as shown in fig. 1 to 3, the cap 41 further includes a second extension arm 413 extending upward from the cap body 311 and opposite to the first extension arm 412, wherein a free end of the second extension arm forms a convex lens 410, it should be understood that the at least one convex lens 410 can be used as a magnifying lens during operation to further improve the convenience of the electric welding pen.

In summary, an electric welding pen based on an embodiment of the present application is illustrated, wherein the electric welding pen has a relatively faster start-up speed, and quantitatively, the start-up speed of the electric welding pen is within 6 s. Moreover, the working area of the welding head 30 has a flat structure, in order to provide further operating possibilities.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims (20)

1. An electric welding pen, comprising:

a housing having a front end portion and an accommodating chamber formed in the housing;

a power supply unit disposed in the housing chamber; and

and the welding head is arranged at the front end part of the shell and comprises a heating inner core electrically connected to the power supply unit and an outer skin wrapping the heating inner core, wherein one part of the welding head protrudes out of the front end part of the shell to form a welding tongue for electric welding.

2. The electrowelding pen of claim 1, wherein said heat-generating core has a flat shape and said solder tab has a flat shape.

3. The electric welding pen of claim 2, wherein the welding tongue comprises a tongue body having at least one side edge forming at least one operating line for electric welding.

4. An electric welding pen according to claim 3 wherein the tongue has a first side and a second side parallel to each other, the first side forming a first operating line for electric welding and the second side forming a second operating line for electric welding, the first operating line being parallel to the second operating line.

5. An electric welding pen according to claim 4 wherein said tongue has a first side between said first and second sides and a second side opposite said first side, wherein at least a portion of said first side forms a first operative surface for electric welding and at least a portion of said second side forms a second operative surface for electric welding.

6. An electric welding pen according to claim 4 wherein the welding tongue comprises a tongue tip extending forward from the tongue body.

7. An electric welding pen according to claim 6 wherein the tip of the tongue tip adopts a circular arc transition.

8. The electric welding pen of claim 2, wherein the portions of the heat generating inner core and the outer skin that protrude out of the front end of the housing form the weld tongues.

9. The electric welding pen of claim 8, wherein the heat generating core comprises a base layer, an insulating layer formed on the base layer, a heat generating layer formed on the insulating layer, and a lead electrically connected to the heat generating layer, wherein the lead is electrically connected to the power supply unit such that the heat generating core is electrically connected to the power supply unit.

10. The electric welding pen of claim 9, wherein the base layer has a front end and a rear end opposite the front end, the heat generating layer being formed at the insulating layer at a location adjacent to the front end of the base layer such that the heat generating layer is at the front end of the solder tab.

11. The electric welding pen of claim 10, wherein the heat generating layer has a U-shaped configuration.

12. The electric welding pen of claim 10, wherein the heat generating inner core further comprises a conductive layer extending from a front end of the base layer to a rear end thereof, wherein the lead is electrically connected to the heat generating layer in such a manner as to be electrically connected to the rear end of the conductive layer.

13. The welding pen of claim 12, wherein the heat-generating core further comprises a protective layer covering at least a portion of the heat-generating core.

14. The electric welding pen of claim 9, wherein the base layer is made of a metallic material.

15. The electric welding pen of claim 9, wherein the sheath is made of a nickel alloy.

16. The welding pen of claim 15, wherein the proportion of nickel in the nickel alloy is equal to or greater than 40%.

17. The electric welding pen of claim 7, wherein the heat generating core comprises a base layer, an insulating layer formed on the base layer, a heat generating layer formed on the insulating layer, and a lead electrically connected to the heat generating layer, wherein the lead is electrically connected to the power supply unit such that the heat generating core is electrically connected to the power supply unit.

18. The welding pen of claim 17, wherein the base layer has a front end and a rear end opposite the front end, the heat generating layer being formed at the insulating layer at a location adjacent the front end of the base layer such that the heat generating layer is located at a tip of the solder tab.

19. The electric welding pen of claim 1, further comprising a cap assembly cooperating with the housing to cover the weld tongue, the cap assembly comprising at least one receiving cavity for receiving a welding wire therein.

20. The electric welding pen of claim 19, wherein the cap assembly further comprises at least one convex lens.

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