WO2022028240A1 - 内镶焊料式管件及焊接工艺 - Google Patents

内镶焊料式管件及焊接工艺 Download PDF

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Publication number
WO2022028240A1
WO2022028240A1 PCT/CN2021/107082 CN2021107082W WO2022028240A1 WO 2022028240 A1 WO2022028240 A1 WO 2022028240A1 CN 2021107082 W CN2021107082 W CN 2021107082W WO 2022028240 A1 WO2022028240 A1 WO 2022028240A1
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WIPO (PCT)
Prior art keywords
solder
pipe fitting
annular groove
pipe
welding
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PCT/CN2021/107082
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English (en)
French (fr)
Inventor
喻曙光
许明泰
崔秀玲
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新乡市丰鑫金属制品有限公司
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Publication of WO2022028240A1 publication Critical patent/WO2022028240A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/14—Soldering, e.g. brazing, or unsoldering specially adapted for soldering seams
    • B23K1/18—Soldering, e.g. brazing, or unsoldering specially adapted for soldering seams circumferential seams, e.g. of shells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
    • B23K33/004—Filling of continuous seams
    • B23K33/006—Filling of continuous seams for cylindrical workpieces

Definitions

  • the invention belongs to the technical field of pipe fitting welding, and in particular relates to an inlaid solder type pipe fitting and a welding process.
  • the domestic copper pipe welding method still adopts open flame heating and welding (as shown in Figure 6).
  • the biggest disadvantages of this method are: 1. The welding penetration is uneven and the welding is not firm. 2. There will be pores after welding, and the virtual welding is easy to leak. (As shown in Figure 7), 3. The liquefied gas is used on site, and the danger of open fire construction is high. 4. The technical requirements of operators are very high, and the market promotion is difficult; the retrieved patent number is CN201510789633.
  • a publication material titled A Welding and Assembly Method for an Air Conditioning Compressor Upper Cover which describes a welding and assembling method for an air conditioning compressor upper cover, including the following steps: inserting the welded end of the exhaust pipe into the upper cover for installation A welding gap is formed between the welding end and the upper cover; solder is filled into the welding gap; welding is carried out by high-frequency welding.
  • the invention adopts the method of high-frequency induction welding to heat and weld the welding seam, which is simple to implement and convenient to process and operate; the size of the welding seam is reasonably controlled, the permeability of the solder is uniform, the quality after welding is stable, and the cost is low; As can be seen from the materials, although the beneficial effects describe that the penetration of the solder is uniform and the quality after welding is stable, it can be seen from the analysis of the structure and welding gap disclosed in the patent that the expected effect cannot be achieved. First of all, the design of this structure, After the solder is melted, the effect of outflow will occur naturally. Because there is no gap for the flow of solder, the outflow solder will flow out of the welding gap, resulting in the welding quality not reaching the effect described in the beneficial effect. In view of these shortcomings, it is necessary to Develop a solder-inlaid pipe fitting and welding process that ensures the penetration depth and firmness of welding, ensures construction safety, and reduces welding difficulty.
  • the purpose of the present invention is to overcome the insufficiency of the prior art, and to provide a solder-inlaid pipe fitting and a welding process that ensure the penetration depth and firmness of welding, ensure construction safety, and reduce the difficulty of welding.
  • the inner solder type pipe fitting is characterized in that: it comprises:
  • a to-be-connected piece which includes a first pipe piece and a second pipe piece;
  • the connecting part comprises an inwardly extending part in which the first pipe piece and the second pipe piece are inserted and overlapped, and a section of the inwardly extending part is deformed outwardly or inwardly to form an annular groove, and the position of the annular groove extends inwardly Between the inner side of the part and the undeformed fitting, it is used to place the solder.
  • the annular groove is arranged on the second pipe and is in a concave structure.
  • the annular groove is arranged on the first pipe and has an outwardly convex structure.
  • the solder contacts connect the first tube and the second tube.
  • the solder is sleeved on the overlapping portion of the first pipe fitting and the second pipe fitting.
  • Step S1 the solder is pre-filled into the annular groove
  • Step S2 Connect the first pipe fitting and the second pipe fitting through a plug-in connection. After the first pipe fitting and the second pipe fitting bracket are inserted and connected, the size of the gap is 0.03-0.08mm, and the gap is used to ensure that the solder melts during welding After the flow is uniform;
  • Step S3 heating the annular groove with a heating machine at a heating temperature of 700° C.-850° C. After the solder is melted, fill the contact gap of the pipe fittings.
  • the solder filling is divided into groove forming and filling, and a ring loader is used for filling.
  • solders are silver solder and phosphor copper solder.
  • the heating machine is a high frequency heating machine.
  • the advantages of the present invention lie in overcoming the shortcomings of traditional external open flame welding and internal solder filling welding methods, especially in terms of the flow uniformity after the solder is melted, making contributions to the uniform flow of the melted solder Better performance; through external electric heating until the internal solder melts naturally (as shown in Figure 8 and Figure 9), the penetration depth and firmness of the welding are ensured (as shown in Figure 10), and the safety of on-site construction is also ensured, which greatly reduces the The difficulty of welding meets the requirements of fast installation and fast welding, and truly realizes that everyone can operate. Other beneficial effects are described in detail in the specific embodiments.
  • FIG. 1 is a front view of the solder-inserted pipe fitting of the present invention.
  • FIG. 2 is a right side view of FIG. 1 .
  • FIG. 3 is a cross-sectional view along A-A in FIG. 2 .
  • Figure 4 is another embodiment of the second pipe.
  • FIG. 5 is a perspective view of FIG. 4 .
  • FIG. 6 is a welding schematic diagram of the old process of the solder-inlaid pipe fitting and the welding process.
  • FIG. 7 is a schematic view after welding of FIG. 6 .
  • FIG. 8 is a schematic view of the structure of the solder-inlaid pipe fitting and soldering process after the solder is installed in the present invention.
  • FIG. 9 is a partial enlarged view of FIG. 8 .
  • FIG. 10 is a schematic diagram of using a high-frequency heating machine.
  • the inner solder fittings including
  • a to-be-connected piece which includes a first pipe piece and a second pipe piece;
  • the connecting part comprises an inwardly extending part in which the first pipe piece and the second pipe piece are inserted and overlapped, and a section of the inwardly extending part is deformed outwardly or inwardly to form an annular groove, and the position of the annular groove extends inwardly Between the inner side of the part and the undeformed fitting, it is used to place the solder.
  • the inwardly extending portion is the part where the first pipe fitting and the second pipe fitting overlap. If the first pipe fitting is on the outside, the inwardly extending portion is a part of the second pipe fitting. If the second pipe fitting is on the outside, the inwardly extending portion is It is a part of the first pipe, the inner extension is provided with an annular groove, and the annular groove is formed such that the inner extension protrudes outward or inward, for example, the inner extension is on the outside, and the annular groove is formed so that the inner extension faces toward the outside.
  • the outer protrusion is formed.
  • the annular groove is formed as the inner protrusion protrudes inward; by arranging solder in the inner cavity of the annular groove, the solder is heated and melted by a welding torch, and the melted solder can Fixing and sealing between the connector and the pipe can effectively improve the connection firmness and sealing.
  • the solder in the annular groove is loaded on the ring loader, and then passes through the shrink on the ring loader, and the solder is sleeved in the annular groove , to avoid falling, which is carried out when the solder is made into a solder ring in advance.
  • the solder can also be powder or paste, and the powder or paste solder can be fed into the annular groove in advance.
  • the annular groove is arranged on the second pipe and is in a concave structure.
  • the annular groove if the annular groove is on the second pipe fitting, the annular groove needs to be concave, and solder can be placed in the concave annular groove.
  • the annular groove is arranged on the first pipe and has an outwardly convex structure.
  • the annular groove if the annular groove is on the first pipe fitting, the annular groove needs to be convex, and solder can be placed in the convex annular groove.
  • solder contacts connect the first pipe fitting and the second pipe fitting.
  • the solder is placed in the annular groove, it is in contact with the first pipe fitting and the second pipe fitting, preferably a transition connection.
  • the solder is sleeved on the overlapping portion of the first pipe fitting and the second pipe fitting.
  • the solder is sleeved on the overlapping portion of the first pipe fitting and the second pipe fitting, which is more convenient to weld the first pipe fitting and the second pipe fitting together after melting.
  • Step S1 the solder is pre-filled into the annular groove
  • Step S2 Connect the first pipe fitting and the second pipe fitting through a plug-in connection. After the first pipe fitting and the second pipe fitting bracket are inserted and connected, the size of the gap is 0.03-0.08mm, and the gap is used to ensure that the solder melts during welding After the flow is uniform.
  • Step S3 heating the annular groove with a heating machine at a heating temperature of 700° C.-850° C. After the solder is melted, fill the contact gap of the pipe fittings.
  • a groove is formed on the first pipe fitting or the second pipe fitting, and an annular groove is formed after the groove is formed. Specifically, whether the groove is formed on the first pipe fitting or on the second pipe fitting On the second pipe fitting, refer to the description in Example 1, and then install the solder in the annular groove. After the solder is installed, insert another pipe fitting (the pipe fitting here is determined as the first pipe fitting or the second pipe fitting according to the installation situation).
  • the size of the inner and outer diameters is maintained after the insertion, and the size of the formed gap is between 0.03-0.08mm, and the preferred solutions are 0.03mm-0.04mm, 0.04mm, 0.04-0.0499mm, 0.05mm, 0.05- 0.08mm; among them, 0.03mm-0.04mm, 0.04mm, 0.04-0.0499mm gap is the best solution; heating temperature is 700°C-850°C, of which 700°C-749°C, 750°C, 750°C-850°C are used as heating The selection of temperature, through experiments, it is known that 700°C-749°C is the optimal heating temperature range; under the above optimal gap and optimal temperature range, the heated and melted solder can completely fill the gap and the range of welding depth If the temperature is too high or the gap is too large, the melted solder will flow out of the gap, and the appearance and quality will be significantly reduced compared with the welding that completely fills the gap, as shown in Figure 10.
  • the gap in the above table is the gap size between the first pipe fitting and the second pipe fitting (shown in the vertical row on the left), and the fullness is the percentage of the melted solder in the total gap (shown in the middle area) , the temperature is the temperature provided by the heater (shown in the upper row).
  • the solder filling is divided into groove forming and filling, and a ring loader is used for filling.
  • the pipe fitting needs to be grooved, that is, the annular groove at the production site is used for subsequent placement of the solder, and then the solder is filled into the groove by a filling machine.
  • solders are silver solder and phosphor copper solder.
  • silver solder and phosphor copper solder are preferable for the solder.
  • the heating machine is a high frequency heating machine.
  • the heating machine is a high-frequency heating machine. can operate.

Abstract

本发明涉及内镶焊料式管件，包括待连接件，其包括第一管件和第二管件；连接部，其包括第一管件和第二管件穿插重合的内伸部，所述内伸部上设置有用于安装焊料的环形槽，所述环形槽设置在第二管件上，呈内凹结构，所述环形槽设置在第一管件上，呈外凸结构，所述焊料接触连接第一管件和第二管件，所述焊料套设于第一管件和第二管件的重合部，包括如下步骤：步骤S1：焊料预先填充至环形槽内；步骤S2：用加热机加热，焊料融化后，填充管件接触的缝隙，所述步骤S1中填充焊料分为起槽和填充，所述焊料为银焊料和磷铜焊料，所述加热机为高频加热机；本发明具有确保焊接的渗透深度和牢固，确保施工安全，降低焊接难度的优点。

Description

内镶焊料式管件及焊接工艺 技术领域
本发明属于管件焊接的技术领域，具体涉及内镶焊料式管件及焊接工艺。
背景技术
目前国内紫铜管的焊接方式还是采用明火加热焊接(如图6)，这种方式最大的缺点是：1、焊接渗透不均焊接不牢固，2、焊接过后会有气孔、虚焊容易泻漏(如图7)，3、现场用液化气体，明火施工危险性高，4、操作工技术要求非常高，市场推广难度大；检索到专利号为CN201510789633.X，公开日为2017.09.15，专利名称为一种空调压缩机上盖的焊接组装方法的一篇公开材料，在该公开材料中描述了一种空调压缩机上盖的焊接组装方法包括以下步骤：排气管的焊接端插入上盖的安装孔，焊接端与上盖之间形成焊接间隙；向焊接间隙内填充焊料；采用高频焊的焊接方式进行焊接。本发明采用高频感应焊接的方式，对焊缝进行加热焊接，实施简单，加工操作方便；且焊缝大小控制合理，焊料的渗透性均匀且焊接后的品质稳定，成本低；通过分析该公开材料可知，虽然在有益效果中描述有焊料的渗透性均匀且焊接后的品质稳定，从该专利中公开的结构、焊接间隙等进行分析可知，并不能达到预期的效果，首先此结构的设计，在焊料融化后，会自然而然发生外流的效果，外流的焊料因为没有缝隙给予流通的路径，因此会流出焊接间隙，导致焊接质量并没有达到有益效果中描述的效果；针对这些不足之处，有必要开发一种确保焊接的渗透深度和牢固，确保施工安全，降低焊接难度的内镶焊料式管件及焊接工艺。
发明内容
本发明的目的是为了克服现有技术的不足，而提供确保焊接的渗透深度和牢固，确保施工安全，降低焊接难度的内镶焊料式管件及焊接工艺。
本发明的目的是这样实现的：内镶焊料式管件，其特征在于：包括
待连接件，其包括第一管件和第二管件；
连接部，其包括第一管件和第二管件穿插重合的内伸部，所述内伸部上的一段经过向外或向内凸起变形，形成环形槽，所述环形槽的位置在内伸部的内侧面与未变形的管件之间，用于放置焊料。
所述环形槽设置在第二管件上，呈内凹结构。
所述环形槽设置在第一管件上，呈外凸结构。
所述焊料接触连接第一管件和第二管件。
所述焊料套设于第一管件和第二管件的重合部。
包括如下步骤：
步骤S1：焊料预先填充至环形槽内；
步骤S2：将第一管件和第二管件通过插入式的连接方式连接，第一管件和第二管件支架经过插入连接后，缝隙大小为0.03-0.08mm，所述缝隙用于确保焊接时焊料融化后的流动均匀；
步骤S3：用加热机加热环形槽，加热温度为700℃-850℃，焊料融化后，填充管件接触的缝隙。
所述步骤S1中填充焊料分为起槽和填充，填充采用装环机。
所述焊料为银焊料和磷铜焊料。
所述加热机为高频加热机。
本发明的有益效果：本发明的优点在于克服了传统外部明火焊接和内部填充焊料的焊接方式的不足，尤其是在焊料融化后的流动均匀性方面，做出了贡献，使得焊料融化的流动均匀性更好；通过外部电加热至内部焊料自然熔化的(如图8和图9)，确保了焊接的渗透深度和牢固(如图10)，同时也确保了现 场施工的安全度，大大降低了焊接难度，实现了快速安装、快速焊接的要求，真正的实现了人人都能操作，其他有益效果在具体实施例中详细说明。
附图说明
图1是本发明内镶焊料式管件的主视图。
图2是图1的右视图。
图3是图2中沿A-A的剖视图。
图4是第二管件的另一种实施例。
图5是图4的立体图。
图6是内镶焊料式管件及焊接工艺的旧工艺的焊接示意图。
图7是图6的焊接后的示意图。
图8是本发明内镶焊料式管件及焊接工艺中安装焊料后的结构示意图。
图9是图8的局部放大图。
图10是使用高频加热机的示意图。
图中：1、第一管件 2、第二管件 3、内伸部 4、焊料 5、环形槽。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例，基于本发明中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
除非另有定义，本说明书所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同，本说明书中所使用的术语只是为了描述具体的实施方式的目的，不是用于限制本发明，本说明书所使用的术语如 “和/或”包括一个或多个相关的所列项目的任意的和所有的组合；此外，下面所描述的本发明不同实施方式中所涉及的技术特征只要彼此之间未构成冲突就可以相互结合。
实施例1
如图1-3所示，内镶焊料式管件，包括
待连接件，其包括第一管件和第二管件；
连接部，其包括第一管件和第二管件穿插重合的内伸部，所述内伸部上的一段经过向外或向内凸起变形，形成环形槽，所述环形槽的位置在内伸部的内侧面与未变形的管件之间，用于放置焊料。
本实施例中内伸部为第一管件和第二管件穿插重合的部分，如果第一管件在外侧，则内伸部为第二管件上的一部分，如果第二管件在外侧，则内伸部为第一管件上的一部分，内伸部上设置有环形槽，环形槽的形成为内伸部向外或向内凸起，例如，内伸部在外侧，环形槽的形成为内伸部向外凸起形成，如果内伸部在内侧，则环形槽的形成为内伸部向内凸起形成；通过在环形槽内腔设置焊料，使用焊枪对焊料进行加热融化，融化后的焊料可以对连接头与管道之间进行固定与密封，可以有效提高连接牢固度与密封性，环形槽内的焊料通过装环机上进行装入，然后通过装环机上的缩口后，焊料套在环形槽内，避免发生掉落，此种情况在焊料事先制作成焊环的情况下进行，另外，焊料也可以为粉状或膏状，可事先将粉状或膏状的焊料送入到环形槽内。
实施例2
所述环形槽设置在第二管件上，呈内凹结构。
如图3所示，本实施例中如果环形槽在第二管件上，则环形槽需要内凹，内凹后的环形槽内可放置焊料。
实施例3
所述环形槽设置在第一管件上，呈外凸结构。
如图4所示，本实施例中如果环形槽在第一管件上，则环形槽需要外凸，外凸后的环形槽内可放置焊料。
实施例4
如图3所示，所述焊料接触连接第一管件和第二管件。
本实施例中焊料放置在环形槽内后，与第一管件和第二管件之间均是接触的方式，优选过渡连接。
实施例5
所述焊料套设于第一管件和第二管件的重合部。
如图3所示，本实施例中焊料套设于第一管件和第二管件的重合部，更方便融化后将第一管件和第二管件焊接在一起。
实施例6
包括如下步骤：
步骤S1：焊料预先填充至环形槽内；
步骤S2：将第一管件和第二管件通过插入式的连接方式连接，第一管件和第二管件支架经过插入连接后，缝隙大小为0.03-0.08mm，所述缝隙用于确保焊接时焊料融化后的流动均匀。
步骤S3：用加热机加热环形槽，加热温度为700℃-850℃，焊料融化后，填充管件接触的缝隙。
如图8-10所示，本实施例中描述了整个焊接的工艺，在第一管件或第二管件上起槽，起槽后形成环形槽，具体起槽是在第一管件上还是在第二管件上，可参照实施例1中的说明，然后在环形槽内安装焊料，焊料安装完成后，再插 入另一管件(此处的管件根据安装情况定第一管件还是第二管件)，两个管件在制作前，内外径的尺寸方面保持在插入后，形成的缝隙大小在0.03-0.08mm之间，优选方案为0.03mm-0.04mm、0.04mm、0.04-0.0499mm，0.05mm，0.05-0.08mm；其中0.03mm-0.04mm、0.04mm、0.04-0.0499mm的间隙均匀最佳方案；加热温度700℃-850℃，其中700℃-749℃、750℃、750℃-850℃分别作为加热温度的选择，经过实验得知，700℃-749℃为最佳加热温度的范围；在以上最佳缝隙和最佳温度的范围下，加热融化后的焊料，能够完全充满缝隙，焊接深度的范围为15-18mm，温度过高或者缝隙过大的话，融化后的焊料将会流出间隙外，与完全充满缝隙的焊接相比，外观上和质量上明显下降，如图10。
下表为实验数据：
Figure PCTCN2021107082-appb-000001
实验数据说明：上述表格中的间隙为第一管件和第二管件之间的间隙大小(左侧竖行所示)，充满度为融化后的焊料占间隙总量的百分比(中间区域所示)，温度为加热机提供的温度(上方横行所示)。
实施例7
所述步骤S1中填充焊料分为起槽和填充，填充采用装环机。
如图8所示，本实施例中填充焊料的过程中，需要对管件进行起槽操作，也即是制作处环形槽，用于后续放置焊料，然后通过填充机将焊料填充到起槽内。
实施例8
所述焊料为银焊料和磷铜焊料。
如图8所示，本实施例中焊料优选银焊料和磷铜焊料。
实施例9
所述加热机为高频加热机。
如图9所示，本实施例中加热机选用高频加热机，高频加热机为带手持枪高频加热机，大大降低了焊接难度，真正的实现了操作间单、方便，人人都能操作。
具体实施方式是对本发明的进一步说明而非限制，对本领域普通技术人员来说在不脱离本发明实质内容的情况下对结构做进一步变换，而所有这些变换都应属于本发明所附权利要求的保护范围。

Claims (9)

  1. 内镶焊料式管件，其特征在于：包括
    待连接件，其包括第一管件和第二管件；
    连接部，其包括第一管件和第二管件穿插重合的内伸部，所述内伸部上的一段经过向外或向内凸起变形，形成环形槽，所述环形槽的位置在内伸部的内侧面与未变形的管件之间，用于放置焊料。
  2. 根据权利要求1所述的内镶焊料式管件，其特征在于：所述环形槽设置在第二管件上，呈内凹结构。
  3. 根据权利要求1所述的内镶焊料式管件，其特征在于：所述环形槽设置在第一管件上，呈外凸结构。
  4. 根据权利要求1所述的内镶焊料式管件，其特征在于：所述焊料接触连接第一管件和第二管件。
  5. 根据权利要求1所述的内镶焊料式管件，其特征在于：所述焊料套设于第一管件和第二管件的重合部。
  6. 用于权利要求1所述的内镶焊料式管件的焊接工艺，其特征在于：包括如下步骤：
    步骤S1：焊料预先填充至环形槽内；
    步骤S2：将第一管件和第二管件通过插入式的连接方式连接，第一管件和第二管件支架经过插入连接后，缝隙大小为0.03-0.08mm，所述缝隙用于确保焊接时焊料融化后的流动均匀；
    步骤S3：用加热机加热环形槽，加热温度为700℃-850℃，焊料融化后，填充管件接触的缝隙，焊接深度为15-18mm。
  7. 根据权利要求6所述的内镶焊料式管件的焊接工艺，其特征在于：所述 步骤S1中填充焊料分为起槽和填充，填充采用装环机。
  8. 根据权利要求6或7所述的内镶焊料式管件的焊接工艺，其特征在于：所述焊料为银焊料和磷铜焊料。
  9. 根据权利要求6所述的内镶焊料式管件的焊接工艺，其特征在于：所述加热机为高频加热机。
PCT/CN2021/107082 2020-08-03 2021-07-19 内镶焊料式管件及焊接工艺 WO2022028240A1 (zh)

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