What equipment is needed for spot welding?
The two main equipments used in the spot welding process are the tool holders and the electrodes. The electrodes are generally made of low resistance alloys, usually copper and the tool holders are used to hold the electrodes in place and also support the water hoses which are used for cooling.
What is hold time in spot welding?
Hold time is the period of time programmed into the weld controller, typically between the end of weld time and the command to open the electrode. The actual hold time is the amount of time for which the electrode force is applied after current ceases to flow.
What are the two important considerations that should keep in mind while designing welding fixtures?
Design Considerations • Certain design considerations apply to fixtures for resistance welding: • (1) keep all magnetic materials, particularly ferrous materials, out of the throat of the welding machine; • (2) insulate all gage pins, clamps, locators, index pins, etc.; • (3) protect all moving slides, bearings, index …
What is a welding torch?
A welding torch is used in an automatic welding system to direct the welding electrode into the arc, to conduct welding power to the electrode, and to provide shielding of the arc area. A torch with a bend is often used for robotic arc welding applications to provide access for the weld.
How strong is a spot weld?
This weld has a shear strength of 1100 lbs. (499.5kg) less than the fully penetrated weld. For a full penetrating spot weld on a given plate thickness, the area of the interface will depend to a large extent on the shielding gas and the arc voltage.
Which material is used as electrodes in spot welding?
The electrodes generally are made of a low resistance alloy, usually copper, and are designed in many different shapes and sizes depending on the application needed. The two materials being welded together are known as the workpieces and must conduct electricity.
Why is hold time required?
This duration is known as hold time. The data that was launched at the current edge should not travel to the capturing flop before hold time has passed after the clock edge. Adherence to hold time ensures that the data launched at current clock edge does not get captured at the same edge.
How hard is it to spot weld?
Spot welding is quick and easy. There is no need to use any fluxes or filler metal to create a join by spot welding, and there is no dangerous open flame. Spot welding can be performed without any special skill.
Which of the following are the correct design considerations of fixtures?
Factors to be considered for the design of Jigs and Fixtures:
- Operations:
- The capacity of the machine:
- Production requirements:
- Importance of location:
- Clamping arrangement:
- Loading and unloading arrangement:
- Ejectors:
- Rigidity and Vibrations:
What are the two types of welding torches?
One can distinguish between two types of welding torches: injector torches for low pressure acetylene and medium pressure torches for high pressure acetylene. Figure 2.3.