What is a weld schedule?
What is a weld schedule?
The Weld Schedule (or Weld Profile) is a record of all welding machine settings plus identification of the machine needed to produce a weld for a given material of a given size and finish. The amplitude and duration of all force and heating parameters can be defined in the ‘weld schedule.
How far apart should spot welds be?
It is recommended that distance between two spot welds should be a minimum of 10 times the material thickness. Sufficient overlap of individual sheets being spot welded is necessary to obtain adequate joint strength and for use of standard electrodes.
What is spot welding cycle?
Spot welding (also known as resistance spot welding) is a resistance welding process. This welding process is used primarily for welding two or more metal sheets together by applying pressure and heat from an electric current to the weld area.
What are the three times that make up a resistance welding schedule in the order that they occur?
The quality of the resistance-welded components depends on the weld schedule. Weld schedules comprise several machine settings: weld current, time, and electrode force are common settings for spot, projection, and seam welding.
What is squeeze time in spot welding?
Squeeze Time is the time interval between the initial application of the electrode force on the work and the first application of current. Squeeze time is necessary to delay the weld current until the electrode force has attained the desired level.
Are spot welds strong?
Spot welding is useful in many circumstances, although there are certain limitations. It can create only localized joins, which may not be particularly strong. The strength of a spot weld depends on the force and temperature that has been applied and on the cleanliness of the electrodes and metal.
Is spot welding easy?
Spot welding is among the earliest welding procedures and is very well-known and easy to do for even beginner welders. The procedure is totally defined and readily applies to a lot of thin metals like stainless steel, nickel alloys and titanium.
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.
How do you set spot welding parameters?
Spot welding parameters
- Electrode force.
- Diameter of the electrode contact surface.
- Squeeze time.
- Weld time.
- Hold time.
- Weld current.
What are the disadvantages of resistance welding?
Disadvantages
- Tools cost will be high.
- The work section thickness is limited because of the current requirement.
- It is less proficient for high-conductive equipment.
- It consumes high electric-power.
- Weld joints contain small tensile & fatigue power.
What is the typical size of a spot weld nugget?
According to the standard, AWS C1. 4M/C1. 4:2009, the diameter of the weld nugget for low carbon steel sheet with a thickness of 1 mm has to be between 3.1 and 4.4 mm. As a result, if the nugget diameter is within the range, the welding strength will be assured.
What are the disadvantages of spot welding?
Disadvantages of Spot Welding:
- Only thin metals can be welded accurately and efficiently.
- Installment cost is more.
- This type of welding gets deformed.
- Changes in power supply leads to weak welding.
Where can I find a resistance welding schedule?
Schedules can be found in the AWS Standard C1.1 and the RWMA Resistance Welding Manual. Below is an excert from the CMW Inc Resistance Welding Catalog showing weld schedule data for low carbon steel.
What should be included in a weld schedule?
It includes all of the specific settings of the machine, control settings, tools, electrodes, forces, times, rates and all other pertinent data related to a job. It also includes the information about the part itself including material, thickness, number of welds, weld locations, quality requirements, and precleaning.
What should the weld temperature be for spot welding?
Weld time and/or weld power need to be increased to spot weld galvanized steel. Welding of steel is done at 2550 degrees F. When MIG welding galvanized steel, the weld puddle is 2550 degrees F.
How are welding current and time used in a body shop?
Welding current and time are used to bring the metal to welding temperature (2550 Degree F.). Weld Temperature = i 2 x t x R. Welding current in a body shop environment has a range of 3000 to 5000 amperes. Welding current ( i ) and weld time (t) are to be controlled by the technician.
