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建立自己的点焊机

2018-3-29 12:31| 发布者: dymodel| 查看: 416| 评论: 0|原作者: baby

摘要: 点焊机在很多领域都有应用,所以建立一台属于自己的点焊机就是非常必要的,这个帖子制作的点焊机使用微波炉变压器。
点焊机在很多领域都有应用,所以建立一台属于自己的点焊机就是非常必要的,这个帖子制作的点焊机使用微波炉变压器。
建立自己的点焊机

以下是英文原文:
Spot welders are used in the fabrication of automobiles, PC cases, power supplies, microwave ovens, electrical junction boxes, Faraday cages, and various electronics. A spot welder is used because it produces a highly defined point of contact weld. The materials are welded without excessive heating, so working pieces are handled easily. 
The weld is also highly controlled and repeatable. In this how-to we cover the basics of a spot welder, and then show you how to build one 
from a microwave oven transformer.
A spot welder’s electrodes serve at least three functions. They transfer electrical energy to the material while also holding it together; this also controls resistance. The greater the pinch force the less the resistance, which results in decreased resistive heating. A lesser pinch force results in increased resistive heating. The electrodes also conduct heat away from the material, while in the off cycles, helping to cool and temper the weld. A
resistive spot weld is commonly referred to as a ‘nugget’. Spot welders are generally confined to ferrous materials which somewhat limits their
application range. Most produce a weld with low voltage and high current. The welder in this How-to operates from a secondary of 3vac. 
The primary is 120vac line voltage that should be treated with respect. 
The low voltage secondary makes the welder very safe, so the electrical shock hazard from the electrode is virtually non-existent. There is however the risk of burn due to the high temperatures as with any welder.
This particular welder is not intended to weld a body panel on your 1966 Jeep; it will not work well on material heavier than 20gauge sheet metal. The intended use is for small projects, for it is not capable of continuous operation. Possible uses are as follows: Welding electrode material for electrolysis cells. Working with the fine components of a vacuum tube.
Building a light weight frame for a small robotic platform. Most of us have enough parts laying around to build a spot welder. If you have a microwave oven transformer (MOT) laying around, then you are half way there. On a related note, we had covered a microwave oven arc welder in 2006.
 
We also needed some heavy gauge copper wire. We used about four feet of 4AWG wire to build the spot welder in the photo. Other materials 
included scrap 2×6, 2×2, two copper screw type lugs, two copper welding cable lugs, two MIG welder tips, two 4″ x 3/4″ zinc plated corner 
braces, drywall screws, and three washers.
 
Pictured above is a working MOT. The first thing we had to do was remove the secondary coils. Namely the high voltage winding, and the low  voltage winding. We used an angle grinder with cut off wheel while being careful not to cut the primary winding


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