1.What material of electrode is advisable fro M6 nut projection welding with 2.4mm thick M.S sheet for better conductivity and wear resistence 2.What is the effect of 'delay' in the strength of nut weld in acapacitor discharge proj welding machine 3.What is the impact of low incoming voltage in a capacitor dischage welding machine 4.Impact of oil on component in welding strength 5.Suggest nuts/parts washing machines - types and how it works etc

-- V.KANNAN (kannan_vk@vsnl.net), July 07, 2002

Answers

1.What material of electrode is advisable fro M6 nut projection welding with 2.4mm thick M.S sheet for better conductivity and wear resistence

The most conductive electrode to use would be a Class 1, but it is also the softest. A lot of times, with nut welding, special nut / stud weld electrodes are used which have Copper-Tungsten faces to allow for longer electrode life. These electrodes have almost the same conductivity as Class 3 and are harder. Class 1, 2, 3, or 11 would work for welding the materials together successfully, but will have different wear characteristics. You will need to do some testing to determine how much electrode wear is considered acceptable to you to make the final decision, keeping in mind that the more conductive the electrode is, the softer it is, and the faster it will wear out.

2.What is the effect of 'delay' in the strength of nut weld in acapacitor discharge proj welding machine

I'm not sure what you are referring to as far as 'delay'. Could you please expand on this so I am sure what the question is here?

Capacitor Discharge systems, in general, work quite well for any type of projection welding due to their fast response in delivering energy. Capacitor Discharge, however, has no feedback characteristics, which means no control over variations in the welds. Inverter weld controls give you this ability, which ultimately allows for better process control of the welds in production.

3.What is the impact of low incoming voltage in a capacitor dischage welding machine

Fluctuations in incoming voltage do not affect the actual weld, but can slow down the recharge of the capacitors, causing a longer period of time to elapse between welds.

4.Impact of oil on component in welding strength

The oil on the parts is typically burned off during the welding process and doesn't usually affect the weld too much. Short time with a Capacitor Discharge and no feedback and adjustment of the energy delivered to the secondary can be more susceptible to weld strength fluctuations with fluctuations in the amount of this oil. Another reason why Inverter technology provides an advantage.

5.Suggest nuts/parts washing machines - types and how it works etc

There are so many types of nuts and materials to work with for this type of application, which makes this a tough question to answer. First, the question is, what are you trying to achieve for strength, quality, appearance and functionality? With this type of information the material selection can be narrowed down better.

Kurt Tolliver Unitek Miyachi Corp.

-- Kurt Tolliver (kurt@unitekmiyachi.com), July 22, 2002.

I feel the best material for nut welding electrodes is simply class II copper. It provides adequate conductivity and lasts plenty long enough given the minimal expense. Many companies will try to sell you a class II copper based electrode with a tungsten steel weld face or a class III copper weld face and say the life span is much greater. This may be true but the added expense for the electrode usually negates the benefit of the fancy material. I have not seen an application yet that a simple class II copper electrode couldn't handle.

-- paul kail (advantekind@aol.com), September 23, 2002.