A soldering assembly method for a semi-rigid cable electrical connector

Abstract

The application relates to the field of electric connectors, in particular to a welding assembly method of a semi-rigid cable electric connector, which comprises the following steps: removing the oxide layer of the semi-rigid cable; assembling the semi-rigid cable and a welding cup and initially filling solder; performing primary welding under the protection of a protective gas; detecting the perpendicularity to determine whether the primary welding meets the standard, if not, the temperature rising rate is increased according to the difference; after meeting the standard, performing secondary solder filling and welding, detecting the fluctuation characteristic value of the welding surface, judging whether the secondary solder filling and welding meet the standard according to the fluctuation characteristic value; if not, judging whether the secondary solder filling and welding meet the standard according to the conductivity; if still not, judging the reason for not meeting the standard according to the fluctuation difference of the welding surface, and adjusting the corresponding parameters according to the reason. Through dynamic optimization of the multi-stage welding parameters, the application realizes the accurate butt joint of the semi-rigid cable and the welding cup, and overcomes the problem that the semi-rigid cable and the welding cup are prone to being inclined and out of concentricity in the welding process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical connectors, and in particular to a welding assembly method for semi-rigid cable electrical connectors. BACKGROUND

[0002] As a key component for current or signal transmission, the performance and reliability of an electrical connector directly affect the stable operation of the entire electrical system. Semi-rigid cable electrical connectors are widely used in complex working conditions that require both flexibility and strength due to their structural characteristics. One of the core manufacturing processes for such connectors is to fixedly connect the end of the semi-rigid cable to the metal welding cup through brazing.

[0003] In the existing welding assembly process, the semi-rigid cable and the welding cup are prone to relative tilting during welding, resulting in eccentricity. This eccentricity problem is mainly caused by the following factors: first, during the heating process, there is an assembly gap between the semi-rigid cable and the welding cup, and the thermal expansion coefficients of the two may differ, resulting in uneven thermal stress distribution; second, the capillary force generated during the melting, filling and solidification of the solder and the buoyancy of the liquid solder on the components can exacerbate the displacement of the components if not properly controlled; finally, the existing process lacks dynamic monitoring and closed-loop feedback adjustment mechanisms for the posture of the components during welding.

[0004] The above eccentricity problem can cause a series of serious quality defects: first, it can lead to uneven solder filling, resulting in virtual welding and cold welding, thereby significantly reducing the mechanical strength and electrical conductivity of the connection point; second, stress concentration occurs at the weld, which can easily cause cracks during long-term use, severely affecting the fatigue life of the product; third, it affects the air tightness of the connector, which can be a fatal defect, especially in high-demand environments.

[0005] To solve the tilting problem, the existing technology usually uses mechanical clamps for forced righting. However, this method has obvious limitations: mechanical clamps can only be statically positioned before welding, and cannot compensate for new displacement caused by thermal deformation and solder flow during dynamic heating and welding. In addition, although some improved processes introduce detection links, they mostly rely on post-welding manual inspection or offline sampling inspection, which cannot achieve real-time diagnosis and parameter self-correction during the process. By the time the problem is discovered, it is too late, resulting in low product pass rate and low production efficiency. SUMMARY

[0006] Therefore, the present application provides a welding assembly method for semi-rigid cable electrical connectors to overcome the problem of eccentricity caused by the tilting of the semi-rigid cable and the welding cup during welding in the prior art.

[0007] To achieve the above-mentioned purpose, the present application provides a welding assembly method for semi-rigid cable electrical connectors, comprising:

[0008] Step S1, stripping and removing the oxide layer from the semi-rigid cable to be welded in sequence;

[0009] Step S2, placing the semi-rigid cable to be welded in the center of the welding cup and performing initial solder filling to complete the pre-assembly welding assembly;

[0010] Step S3, heating the pre-assembled welding assembly to a preset temperature in a protective gas atmosphere and maintaining it for a preset period of time, then cooling it to complete the pre-welding of the welding assembly;

[0011] Step S4, obtaining the perpendicularity of the welding assembly after pre-welding, and determining whether the pre-welding of the welding assembly meets the preset standard according to the perpendicularity;

[0012] Step S5, in response to determining that the pre-welding meets the preset standard, assembling the semi-rigid cable and the welding cup and performing secondary solder filling welding on the gap between the two, and obtaining the welding surface fluctuation characteristic value after the secondary solder filling welding;

[0013] Step S6, determining whether the secondary solder filling welding meets the preset standard according to the welding surface fluctuation characteristic value;

[0014] Step S7, in response to the secondary solder filling welding not meeting the preset standard, checking whether the secondary solder filling welding meets the preset standard according to the electrical conductivity.

[0015] Further, according to the perpendicularity, it is determined whether the pre-welding meets the preset standard, wherein,

[0016] If the perpendicularity is less than a preset perpendicularity threshold, it is determined that the pre-welding meets the preset standard;

[0017] If the perpendicularity is greater than or equal to the preset perpendicularity threshold, it is determined that the pre-welding does not meet the preset standard, and the preset heating rate of the pre-welding is increased according to the difference between the perpendicularity and the preset perpendicularity threshold.

[0018] Further, the increase range of the preset heating rate of the pre-welding is positively correlated with the difference between the perpendicularity and the preset perpendicularity threshold.

[0019] Further, in response to the welding surface fluctuation characteristic value being less than a first preset welding surface fluctuation threshold, it is determined that the secondary solder filling welding meets the preset standard;

[0020] In response to the welding surface fluctuation characteristic value being greater than or equal to the first preset welding surface fluctuation threshold and less than a second preset welding surface fluctuation threshold, it is determined that the secondary solder filling welding does not meet the preset standard, and the electrical conductivity is checked to determine whether the secondary solder filling welding meets the preset standard.

[0021] In response to the welding surface fluctuation characteristic value being greater than or equal to a second preset welding surface fluctuation threshold value, it is determined that the second filler metal welding does not meet the preset standard, and a reason for the second filler metal welding not meeting the preset standard is determined according to the welding surface fluctuation difference value.

[0022] The welding surface fluctuation characteristic value is a ratio of a standard deviation to an average value of each wave crest and a corresponding wave trough in the welding wave.

[0023] Further, in response to the electrical conductivity being less than a preset electrical conductivity threshold value, it is checked that the second filler metal welding does not meet the preset standard, and a preset length of the second filler metal welding is reduced according to a difference between the preset electrical conductivity threshold value and the electrical conductivity.

[0024] Further, in response to the electrical conductivity being greater than or equal to a preset electrical conductivity threshold value, it is checked that the second filler metal welding meets the preset standard.

[0025] Further, in response to the welding surface fluctuation difference value being less than a preset welding surface fluctuation difference threshold value, it is determined that a reason for the second filler metal welding not meeting the preset standard is that the preset temperature increase rate is substandard, and the preset temperature increase rate is increased according to a difference between the preset welding surface fluctuation difference threshold value and the welding surface fluctuation difference value.

[0026] Further, in response to the welding surface fluctuation difference value being greater than or equal to a preset welding surface fluctuation difference threshold value, it is determined that a reason for the second filler metal welding not meeting the preset standard is that a gas velocity of the protective gas is substandard, and the gas velocity of the protective gas is reduced according to a difference between the welding surface fluctuation difference value and the preset welding surface fluctuation difference threshold value.

[0027] The welding surface fluctuation difference value is a difference between the welding surface fluctuation characteristic value and the second preset welding surface fluctuation threshold value.

[0028] Further, an increase amplitude of the preset temperature increase rate is positively correlated to the difference between the preset welding surface fluctuation difference threshold value and the welding surface fluctuation difference value.

[0029] Further, a reduction amplitude of the gas velocity of the protective gas is positively correlated to the difference between the welding surface fluctuation difference value and the preset welding surface fluctuation difference threshold value.

[0030] Compared with the prior art, the present application has the beneficial effect that the prior art relies on a mechanical clamp for static positioning and cannot compensate for dynamic deviation caused by thermal deformation and solder flow during heating and welding. The present application detects the perpendicularity of the semi-rigid cable in real time through step S4 and dynamically adjusts the preset temperature increase rate according to the detection result, forming a closed-loop regulation mechanism, effectively suppressing the relative inclination of the parts and ensuring the concentricity of the semi-rigid cable and the welding cup.

[0031] Further, the prior art often uses post-weld manual visual inspection or offline sampling inspection, and when problems are found, it is already impossible to remedy. The present application introduces perpendicularity detection after pre-welding, and after secondary filler metal welding, combines welding surface fluctuation characteristic value detection and conductivity verification to realize real-time diagnosis and parameter self-correction in the process. For example, according to the welding surface fluctuation characteristic value, the problem source is automatically identified, and the process parameters are adjusted accordingly, thereby avoiding defects such as false welding, cold welding, and stress concentration, and improving the mechanical strength, conductivity, and airtightness of the connection point.

[0032] Further, the present application automatically adjusts key parameters in a data-driven manner, where the adjustment amplitude is positively correlated with the deviation of the detection value, ensuring the adaptability and consistency of the process. This overcomes the shortcomings of the prior art, which relies on experience adjustment and cannot respond to process changes in real time, reduces waste, improves production efficiency, and is especially suitable for high-demand batch production environments.

[0033] Further, by strictly controlling the concentricity and welding quality during the welding process, the present application reduces the stress concentration and crack risk at the weld, thereby improving the fatigue life and long-term reliability of the electrical connector, meeting the requirements for flexibility and strength under complex working conditions.

[0034] Further, the prior art usually fills the filler metal and welds at one time, which is easy to cause uneven distribution of the solder due to thermal stress and capillary action. The present application innovatively adopts a phased process combining "pre-welding" and "secondary filler metal welding". Pre-welding forms a preliminary positioning foundation that has been calibrated for perpendicularity, and secondary filler metal welding performs supplementary filling and finishing on a more stable basis. This "positioning first, then plumping" strategy effectively avoids internal porosity and slag inclusion during the one-time filling process of the solder, making the internal structure of the weld more dense and improving the mechanical strength and long-term reliability of the connector.

[0035] Further, the present application goes beyond simple "pass / fail" judgment and can perform in-depth root cause analysis on unqualified products. When secondary filler metal welding is initially determined to be unqualified, the system can intelligently diagnose whether the problem source is "pre-set heating rate not meeting standards" or "protective gas velocity not meeting standards" by comparing the welding surface fluctuation characteristic value with the threshold value and combining conductivity verification. This root cause positioning capability makes the adjustment of process parameters no longer a blind trial-and-error, but a targeted and precise optimization, improving process stability and problem-solving efficiency.

[0036] Further, in the prior art, the perpendicularity, welding quality, etc. are subjectively judged by the experience of the operator, and the consistency is poor. The present application uses quantifiable characterization values and preset threshold values for comparison and decision-making throughout the process. For example, the welding surface fluctuation characterization value is defined as the ratio of the standard deviation to the average value of each wave peak and corresponding trough in the welding wave. This is an accurate and calculable mathematical index. This data-driven quality control method reduces human factor interference and ensures high consistency of product quality and repeatability of the process.

[0037] Further, the protective atmosphere in the prior art is mostly static or fixed flow rate, which is difficult to cope with the changes in local airflow during actual heating. The present application takes the gas velocity of the protective gas as a key controllable variable and correlates it with the welding quality in a closed loop. When the problem is diagnosed as a substandard gas velocity, the system will automatically increase the gas velocity in a positive correlation. This dynamic gas protection strategy ensures that the welding area is effectively isolated from oxygen at any time, preventing the secondary oxidation of the semi-rigid cable and the welding cup at high temperatures, thereby ensuring the wetting and spreading properties of the filler metal. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 A welding assembly method flowchart for a semi-rigid cable electrical connector according to an embodiment of the present application;

[0039] Figure 2 A flowchart for determining whether the initial welding process meets the preset standard according to the perpendicularity according to an embodiment of the present application;

[0040] Figure 3 A flowchart for determining whether the secondary filler metal welding meets the preset standard according to the welding surface fluctuation characterization value according to an embodiment of the present application;

[0041] Figure 4 A flowchart for determining whether the secondary filler metal welding meets the preset standard according to the electrical conductivity of the electrical connector according to an embodiment of the present application;

[0042] Figure 5 A flowchart for determining the reason why the secondary filler metal welding does not meet the preset standard according to the welding surface fluctuation difference value according to an embodiment of the present application;

[0043] Figure 6 A schematic diagram of the overall structure of a semi-rigid cable welding tool assembly according to an embodiment of the present application;

[0044] In the figure: 1, lifting slide; 2, centralizing block; 3, bottom plate; 4, positioning seat; 5, induction welding; 6, semi-rigid cable. DETAILED DESCRIPTION

[0045] In order to make the objects, technical schemes and advantages of the present application clearer, the following further describes the present application with reference to the embodiments; it should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0046] The preferred embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and not to limit the protection scope of the present application.

[0047] Please refer to Figures 1-6 As shown in the drawings, they are respectively a welding assembly method flowchart of a semi-rigid cable electrical connector according to an embodiment of the present application; a flowchart for determining whether the primary welding treatment meets the preset standard according to the perpendicularity of the present application; a flowchart for determining whether the secondary filler metal welding meets the preset standard according to the welding surface fluctuation characteristic value of the present application; a flowchart for checking whether the secondary filler metal welding meets the preset standard according to the electrical conductivity of the electrical connector of the present application; a flowchart for determining the reason why the secondary filler metal welding does not meet the preset standard according to the welding surface fluctuation difference value of the present application; and a schematic diagram of the overall structure of a semi-rigid cable welding tool assembly according to an embodiment of the present application.

[0048] The welding assembly method of a semi-rigid cable electrical connector according to an embodiment of the present application comprises:

[0049] Step S1, sequentially performing wire stripping and oxidation layer removal on the semi-rigid cable to be welded;

[0050] Step S2, placing the semi-rigid cable to be welded into the center of the welding cup and then performing primary filler metal treatment to complete a pre-assembly welding assembly;

[0051] Step S3, heating the pre-assembled welding assembly to a preset temperature in a protective gas atmosphere and maintaining for a preset time length, and then cooling to complete the pre-welding of the welding assembly;

[0052] Step S4, obtaining the perpendicularity of the welding assembly after pre-welding, and determining whether the pre-welding of the welding assembly meets the preset standard according to the perpendicularity;

[0053] Step S5, in response to determining that the pre-welding meets the preset standard, assembling the semi-rigid cable and the welding cup and performing secondary filler metal welding on the gap therebetween, and obtaining the welding surface fluctuation characteristic value after the secondary filler metal welding;

[0054] Step S6, determining whether the secondary filler metal welding meets the preset standard according to the welding surface fluctuation characteristic value;

[0055] Step S7, in response to the secondary filler metal welding not meeting the preset standard, checking whether the secondary filler metal welding meets the preset standard according to the electrical conductivity.

[0056] Specifically, the semi-rigid cable 6 needs to be fixed and welded by the semi-rigid cable 6 welding tool assembly during the relevant operation. Among them, the lifting slide 1, the centralizing block 2, the bottom plate 3 and the positioning seat 4 components jointly play a role, the semi-rigid cable 6 tail pipe hole is positioned on the positioning seat 4, the through hole of the induction welding 5 is positioned on the semi-rigid dielectric layer, the semi-rigid product and the tail pipe are guaranteed on the same center axis, and the centralizing block 2 clamps the middle part of the semi-rigid cable 6. Such a fixing mode can ensure that the semi-rigid cable 6 remains stable during the subsequent processing process and will not be loose or deviated. And then, when the semi-rigid cable 6 and the welding cup are connected and processed, the induction welding 5 welding method is adopted. The induction welding 5 can efficiently and accurately weld the semi-rigid cable 6 and the welding cup together, so as to ensure that the connection between the two is firm and reliable, and meet the relevant process requirements and performance standards.

[0057] Specifically, the preset temperature is set to 280-320℃, preferably 300℃, which can ensure that the solder is fully melted and prevent high temperature from damaging the internal structure of the cable, thereby providing a basic guarantee for the stability of the subsequent welding quality. In actual operation, the temperature sensor built-in the welding tool assembly can monitor the temperature of the welding area in real time, and the monitoring data is fed back to the control system, and the output power of the induction welding 5 equipment is automatically adjusted by the control system according to the preset parameters, so as to accurately control the temperature rising rate and the final welding temperature; the preset time is set to 15-30 seconds, preferably 20 seconds, which can ensure that the solder fully infiltrates the connection interface between the semi-rigid cable 6 and the welding cup in the molten state, promote the diffusion and combination between atoms, and form a stable metallurgical bonding layer; at the same time, it can avoid the situation that the solder cannot completely fill the gap due to too short time, or the solder is excessively lost and the performance of the internal material of the cable is degraded due to too long time. During the welding process, the control system automatically starts timing when the preset temperature is reached, and immediately controls the induction welding 5 equipment to stop heating when the preset time is up, so that the welding area is quickly solidified under the condition of natural cooling or auxiliary cooling, further improving the strength and electrical performance of the welded joint.

[0058] Specifically, the surface detection device can use a laser three-dimensional profilometer, which can obtain three-dimensional coordinate data of the welding corrugation by high-precision scanning of the surface of the welding cup, and then calculate the standard deviation and average value of the wave crest and wave trough, and finally obtain the welding surface fluctuation representation value.

[0059] Specifically, according to the perpendicularity, it is determined whether the pre-welding treatment meets the preset standard, wherein,

[0060] If the perpendicularity is less than a preset perpendicularity threshold, it is determined that the pre-welding process meets the preset standard.

[0061] If the perpendicularity is greater than or equal to the preset perpendicularity threshold, it is determined that the pre-welding process does not meet the preset standard, and a preset heating rate of the pre-welding process is increased according to a difference between the perpendicularity and the preset perpendicularity threshold.

[0062] Specifically, the perpendicularity is an angle between an axis of the semi-rigid cable 6 and a central axis of the welding cup in the vertical direction. The preset perpendicularity threshold is set to 0.05°-0.15°, preferably 0.1°. In actual detection, the laser displacement sensor can be integrated on the centralizing block 2 of the welding tool assembly, and non-contact measurement is performed in a clamped state after the pre-welding is completed, so as to avoid errors introduced by secondary clamping and ensure the accuracy and timeliness of the detection result.

[0063] Specifically, the increase amplitude of the preset heating rate of the pre-welding process is positively correlated with the difference between the perpendicularity and the preset perpendicularity threshold. It can be understood that the positive correlation is, for example, linear positive correlation or nonlinear positive correlation, and the specific linear positive correlation slope is not limited, which can be set according to actual preparation conditions, as long as the increase amplitude of the preset heating rate of the pre-welding process is greater when the difference between the perpendicularity and the preset perpendicularity threshold is greater. For example, the increase amplitude of the preset heating rate of the pre-welding process is set to ΔM, the difference between the perpendicularity and the preset perpendicularity threshold is set to Δμ, ΔM=γ×(Δμ+μ0), γ is a heating rate adjustment coefficient, γ is set to 1.06, and μ0 is a constant.

[0064] Specifically, in response to the welding surface fluctuation representation value being less than a first preset welding surface fluctuation threshold, it is determined that the second filler metal welding meets the preset standard;

[0065] In response to the welding surface fluctuation representation value being greater than or equal to the first preset welding surface fluctuation threshold and less than a second preset welding surface fluctuation threshold, it is preliminarily determined that the second filler metal welding does not meet the preset standard, and whether the second filler metal welding meets the preset standard is verified according to the electrical conductivity.

[0066] In response to the welding surface fluctuation representation value being greater than or equal to the second preset welding surface fluctuation threshold, it is determined that the second filler metal welding does not meet the preset standard, and a reason why the second filler metal welding does not meet the preset standard is determined according to the welding surface fluctuation difference.

[0067] Specifically, the first preset welding surface fluctuation threshold is set to 0.05 mm, and the second preset welding surface fluctuation threshold is set to 0.12 mm. The first preset welding surface fluctuation threshold is set by comprehensively considering the thermal expansion coefficient of the welding material and the structural precision requirement of the connector, to ensure that the slight fluctuation within the threshold range will not have a substantial impact on the welding strength and electrical performance; the second preset welding surface fluctuation threshold is used as a critical value for judging whether the welding quality has a serious defect, and when the fluctuation representation value reaches or exceeds this value, problems such as stress concentration and abnormal contact resistance may occur at the welding position, so the subsequent assembly process needs to be stopped immediately and the welding process parameters need to be recalibrated.

[0068] The welding surface fluctuation representation value is the ratio of the standard deviation to the average value of each wave peak and the corresponding wave trough in the welding ripples.

[0069] Specifically, in response to the electrical conductivity being less than the preset electrical conductivity threshold, it is verified that the second soldering does not meet the preset standard, and the preset duration of the second soldering is reduced according to the difference between the preset electrical conductivity threshold and the electrical conductivity.

[0070] Specifically, in response to the electrical conductivity being greater than or equal to the preset electrical conductivity threshold, it is verified that the second soldering meets the preset standard.

[0071] Specifically, the preset electrical conductivity threshold is set to 10 mΩ-20 mΩ, preferably 15 mΩ. The threshold is set based on the contact resistance requirement of the electrical connector under the rated working current, to ensure the stability and low loss of signal transmission. In actual verification, the electrical conductivity of the welded assembly after welding can be tested by four-probe method or micro-ohmmeter, and the test result is compared with the preset threshold.

[0072] Specifically, in response to the welding surface fluctuation difference value being less than the preset welding surface fluctuation difference threshold, it is determined that the reason why the second soldering does not meet the preset standard is that the preset heating rate is not up to standard, and the preset heating rate is improved according to the difference between the preset welding surface fluctuation difference threshold and the welding surface fluctuation difference value.

[0073] Specifically, in response to the welding surface fluctuation difference value being greater than or equal to the preset welding surface fluctuation difference threshold, it is determined that the reason why the second soldering does not meet the preset standard is that the gas velocity of the protective gas is not up to standard, and the gas velocity of the protective gas is reduced according to the difference between the welding surface fluctuation difference value and the preset welding surface fluctuation difference threshold.

[0074] The welding surface fluctuation difference value is the difference between the welding surface fluctuation representation value and the second preset welding surface fluctuation threshold.

[0075] Specifically, the preset welding surface fluctuation difference threshold is set to 0.04 mm, and the setting of the threshold needs to be combined with the fluidity of the welding material and the heat field distribution characteristics of the welding area to ensure that the welding surface fluctuation caused by abnormal heating rate can be accurately distinguished from the fluctuation difference caused by the problem of the protective gas speed. When the welding surface fluctuation difference is less than 0.04 mm, it indicates that the fluctuation is mainly caused by the fact that the heating rate fails to match the thermal response requirement of the material, for example, insufficient melting of the solder due to slow heating, poor fluidity, or local overheating caused by too fast heating, which causes the solder to splash; when the difference is greater than or equal to 0.04 mm, it is determined that the protective gas speed is abnormal, for example, the speed is too low to cause oxidation of the welding area, or the speed is too high to interfere with the normal spreading of the solder, thereby providing a clear direction for subsequent parameter adjustment.

[0076] Specifically, the preset heating rate increase amplitude is positively correlated with the difference between the preset welding surface fluctuation difference threshold and the welding surface fluctuation difference. It can be understood that the preset heating rate increase adjustment mode can refer to the preset heating rate increase adjustment mode of the pre-welding process described above, which will not be repeated here.

[0077] Specifically, the speed reduction amplitude of the protective gas is positively correlated with the difference between the welding surface fluctuation difference and the preset welding surface fluctuation difference threshold. It can be understood that the speed reduction adjustment mode of the protective gas can refer to the preset heating rate increase adjustment mode of the pre-welding process described above, which will not be repeated here.

[0078] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

[0079] The above description is only the preferred embodiments of the present application and is not used to limit the present application; for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A solder assembly method for a semi-rigid cable electrical connector, characterized by, It comprises, Step S1, stripping and deoxidizing layer processing are sequentially performed on the semi-rigid cable to be welded; Step S2, the semi-rigid cable to be welded is placed in the center of the welding cup, and then the initial filler metal processing is performed to complete the pre-assembled welding assembly; Step S3, the pre-assembled welding assembly is heated to a preset temperature in a protective gas atmosphere, and then cooled to complete the pre-welding of the welding assembly; Step S4, the perpendicularity of the welding assembly after pre-welding is obtained, and whether the pre-welding of the welding assembly meets the preset standard is determined according to the perpendicularity; Step S5, in response to determining that the pre-welding meets the preset standard, the semi-rigid cable and the welding cup are assembled, and the gap between the two is subjected to secondary filler metal welding, and the welding surface fluctuation characteristic value after secondary filler metal welding is obtained; Step S6, whether the secondary filler metal welding meets the preset standard is determined according to the welding surface fluctuation characteristic value; Step S7, in response to the secondary filler metal welding not meeting the preset standard, whether the secondary filler metal welding meets the preset standard is verified according to the electrical conductivity; If the perpendicularity is less than a preset perpendicularity threshold, it is determined that the pre-welding meets the preset standard; If the perpendicularity is greater than or equal to the preset perpendicularity threshold, it is determined that the pre-welding does not meet the preset standard, and the preset heating rate of the pre-welding is increased according to the difference between the perpendicularity and the preset perpendicularity threshold; In response to the welding surface fluctuation characteristic value being less than a first preset welding surface fluctuation threshold, it is determined that the secondary filler metal welding meets the preset standard; In response to the welding surface fluctuation characteristic value being greater than or equal to the first preset welding surface fluctuation threshold and less than a second preset welding surface fluctuation threshold, it is determined that the secondary filler metal welding does not meet the preset standard, and whether the secondary filler metal welding meets the preset standard is verified according to the electrical conductivity; In response to the welding surface fluctuation characteristic value being greater than or equal to the second preset welding surface fluctuation threshold, it is determined that the secondary filler metal welding does not meet the preset standard, and the reason why the secondary filler metal welding does not meet the preset standard is determined according to the welding surface fluctuation difference value; The welding surface fluctuation characteristic value is the ratio of the standard deviation to the average value of each wave crest and corresponding wave trough in the welding wave.

2. The solder assembly method of a semi-rigid cable electrical connector according to claim 1, wherein, The increase range of the preset heating rate of the pre-welding is positively correlated with the difference between the perpendicularity and the preset perpendicularity threshold.

3. The solder assembly method of a semi-rigid cable electrical connector according to claim 2, wherein, In response to the electrical conductivity being less than a preset electrical conductivity threshold, it is verified that the secondary filler metal welding does not meet the preset standard, and the preset time length of the secondary filler metal welding is reduced according to the difference between the preset electrical conductivity threshold and the electrical conductivity.

4. The solder assembly method of a semi-rigid cable electrical connector according to claim 3, wherein, In response to the electrical conductivity being greater than or equal to the preset electrical conductivity threshold, it is verified that the secondary filler metal welding meets the preset standard.

5. The solder assembly method of a semi-rigid cable electrical connector according to claim 4, wherein, In response to the welding surface fluctuation difference value being less than a preset welding surface fluctuation difference threshold, it is determined that the reason why the secondary filler metal welding does not meet the preset standard is that the preset heating rate is not up to standard, and the preset heating rate is increased according to the difference between the preset welding surface fluctuation difference threshold and the welding surface fluctuation difference value.

6. The solder assembly method of a semi-rigid cable electrical connector according to claim 5, wherein, determining that the reason that the secondary filler metal welding does not meet the preset standard is that the gas velocity of the shielding gas is not up to standard, and reducing the gas velocity of the shielding gas according to the difference between the welding surface fluctuation difference value and the preset welding surface fluctuation difference threshold value; the welding surface fluctuation difference value is a difference between the welding surface fluctuation characteristic value and a second preset welding surface fluctuation threshold value.

7. The solder assembly method of a semi-rigid electrical cable connector according to claim 6, wherein The preset temperature rising rate is positively correlated with the difference between the preset welding surface fluctuation difference threshold value and the welding surface fluctuation difference value.

8. The solder assembly method of a semi-rigid cable electrical connector according to claim 7, wherein, The preset temperature rising rate is positively correlated with the difference between the preset welding surface fluctuation difference threshold value and the welding surface fluctuation difference value. The gas velocity of the shielding gas is positively correlated with the difference between the welding surface fluctuation difference value and the preset welding surface fluctuation difference threshold value.

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