试验考察了熔核的形成和长大过程。
Experiments were conducted to examine the process of nugget initiation and growth.
在熔核内发现结晶裂纹。
该规律反映了点焊熔核与焊接电流频谱的内在关系。
The relationship between nugget size and current spectrum is found.
试验结果表明，焊点强度满足要求，熔核尺寸符合要求。
The results show the strength and the dimension of spot meet the requirements.
动态电阻曲线频谱图中也同样可以提取出与熔核直径相关的信息。
The correlated information can be picked up in the frequency spectrum charts of dynamic resistance curves.
电阻点焊接头的焊接强度由母材和熔核的材料属性及几何特征决定。
Strength of resistance spot weld is determined by the physical attributes of weldment including material and geometric issues.
液相流动促进气泡的碰撞、合并及迁移是气孔沿熔核周边分布的主要原因。
The liquid phase flow promotes the collision, coalescence and movement of bubbles, resulting in that porosities distribute along the periphery of nugget.
点焊过程中的声音信号包含着熔核形成信息，是点焊质量监控的重要参数。
Experiment results indicate that air-borne acoustic signals contain information about weld nugget states and can be viewed as a kind of parameters that indicate the welding quality.
应用二次脉冲电流，改变电阻焊熔核的金属组织结构，达到提高焊接强度的目的。
The twice impulse process is employed to change the metallic structure of the resistance welding so as to improve the welding strength.
焊点处形状记忆效应消失，在焊点熔核外热影响区以外形状记忆效应跟母材相同。
The shape memory effect in weld disappear, beyond the HAZ, shape memory effect resume.
介绍了基于有限元法模拟电阻点焊熔核形成过程中的轴对称电、热、力耦合场的模拟模型。
Based on FEM, an axis symmetric finite element electro-thermo-mechanical model in the formation of molten core of resistance spot welding is introduced.
而由于点焊熔核形成过程的不可见性，计算机模拟技术已经成为研究电阻点焊的主要方法。
Numerical simulation has been a main research method in resistance spot welding since the forming process of nugget is hard to observe.
从电流信号的频谱图中寻找与熔核直径相关的特征，建立起电流频谱与熔核直径的关系曲线。
The characteristic of the correlation between frequency spectrum and nugget size is studied, and the relationship is founded.
根据三层不锈钢板电阻点焊熔核形成过程，建立了模拟三层板点焊温度场的轴对称有限元模型。
An axisymmetric finite element model is developed to simulate the temperature field of resistant spot welding according to the process of nugget formation of three layers stainless steel sheets.
以异质材料低碳钢与纯镍电阻点焊为例建立了电阻点焊熔核形成过程的电热耦合有限差分模型。
A three dimensional finite difference electric thermos model for resistance spot welding nugget process of dissimilar materials is introduced.
基于对实际点焊接头硬度分布的分析，建立了包括熔核、热影响区和母材的单点点焊搭接接头计算模型。
Based on the hardness analyses of actual spot welded joints, a computational model that consists of nugget, HAZ and base metal is established for the single point spot welded lap joints.
点焊试样剪切试验中存在脱壳式、剪断式和压断式三种断裂模式，所对应的熔核尺寸和剪切载荷依次增加。
There are three fracture modes in shearing tests, i. e. , exuviation, shear and crush fractures, with nugget dimensions and shearing loads increasing in turn.
通过结构、热电场的全耦合，分析了焊接过程中接触面压力变化规律，单边焊熔核形成过程以及形核特点等。
The change rule of the contact pressure, nucleation process and character were investigated by the coupled thermal-electrical-mechanical analysis.
采用与模拟一致的工艺参数对铝合金板材分别进行点焊实验，制取接头低倍金相照片，并测量熔核直径和焊透率。
Do spot welding experiments to aluminum alloy plate in the same condition of simulation, prepare low magnification metallographic photos of joint, and measure nugget diameter and penetration rate.
根据计算流体力学与传热学原理，建立了描述铝合金电阻点焊液态熔核流动行为和传热过程的轴对称有限元模型。
Based on theories of computational fluid dynamics and heat transfer, an axial symmetry finite element model of velocity and temperature field of spot welding for aluminum alloy is established.
管板单边电阻点焊由于其焊接结构的特殊性，生成熔核的外形为环状，其强度不能用传统的圆形焊点强度经验公式计算。
The strength of the ring nugget in sheet-to-tube single-sided spot welding is different from that of the button nugget in traditional sheet-to-sheet spot welding.
结果表明：储能焊能够实现TC4钛合金薄板的快速凝固焊接，焊接接头由熔核和熔核向母材过渡的熔合区（线）组成。
The results show that the welding of TC4 can be realized by capacitor discharge welding. The joint microstructure consists of nugget zone and semi-melt zone.
研究了分流和翘曲变形影响下的不锈钢点焊动态电阻曲线，发现了动态电阻曲线的准稳态电阻值与熔核直径之间的对应关系。
In this paper, the curves of Dynamic Resistance CurveDRCare studied under the influence of shunt and distortion. The relationship between quasi steady resistance value and nugget diameter is found.
并针对DP590GA焊点熔核中锌元素的残留现象，设计出加预热的双脉冲焊接规范，进一步改善其点焊接头的力学性能。
Aiming at the zinc residue in the weld joint nugget of DP590GA, a double-impulse welding parameter with preheating impulse is designed to further improve its mechanical properties of the weld joint.
并针对DP590GA焊点熔核中锌元素的残留现象，设计出加预热的双脉冲焊接规范，进一步改善其点焊接头的力学性能。
Aiming at the zinc residue in the weld joint nugget of DP590GA, a double-impulse welding parameter with preheating impulse is designed to further improve its mechanical properties of the weld joint.
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