摘要本文针对某厂车桥支撑加强板与圆形焊接螺母的凸焊存在的质量问题，采用 固定式中频逆变电焊机对 H260PD+Z-100-X-FC-Y 镀锌钢板与 10B21 螺母进行凸焊 试验研究，通过调整预热电流、预热时间、焊接电流、焊接时间、电极压力等凸 焊参数，分析了凸焊工艺参数对焊缝质量的影响规律，找出了合理的车桥支撑加 强板与圆形焊接螺母凸焊工艺参数。试验结果表明：在预热电流 20 KA、预热时 间 6 cyc、焊接电流 33KA、焊接时间 20 cyc、电极压力为 9900N 时，满足了焊接 质量要求。68482

破坏性试验表明：3 个凸点中至少有两个凸点能拉破本体（镀锌钢板侧）。 金相分析结果表明：在不损坏螺纹前提下，凸点熔核的宽度大于 2mm、熔深

在 0.2mm 以上，凸点组织为 F+P，且熔核有典型的柱状晶组织。

毕业论文关键词：镀锌钢板 圆形螺母 凸焊工艺 金相组织

Title Experimental study on circular welded nut projection welding galvanized steel

Abstract

In this paper, the reinforcement plate and circular projection welding weld nut quality problems axle factory support for using fixed frequency inverter welding machine for H260PD + Z-100-X-FC-Y galvanized steel nuts and 10B21 convex Experimental study welding, preheating current by adjusting the preheating time, welding current, welding time, electrode pressure projection welding parameters analyzed projection welding process parameters on weld quality, find a reasonable axle support to strengthen plate with circular welded nut projection welding process parameters. The test results showed that: in the preheating current 20 KA, warm-up time 6 cyc, welding current 33KA, welding time 20 cyc, electrode pressure when 9900N, meet the quality requirements of welding.

Destructive tests showed that: there are at least three bump-breaking body can pull two bumps (galvanized steel plate side).

Metallographic analysis showed that: the thread is not damaged under the premise that the width of the bump nugget than 2mm, 0.2mm depth of penetration in the above bump organization F + P, and the nugget is typical columnar grain structure.

Keywords：Galvanized steel round nut projection Projection welding process Microstructure

目 次

1 绪论 3

1．1 选题背景及意义 3

1．2 镀锌钢板的性能及发展现状 4

1．3 高强度钢的性能及发展现状 5

1．4 镀锌钢板焊接研究现状 7

1．5 螺母凸焊焊接技术应用的研究现状 8

1．6 本课题研究主要内容 9

2 试验材料、设备及方案 10

2．1 试验材料 10

2．2 试验设备 12

2．3 试验方案 15

3 圆形焊接螺母与镀锌钢板的凸焊实验过程及结果