How is welding current calculated?
To get the results in KJ/in or KJ/mm, divide the result by 1000.
- Example 1: If a welder takes 2 minutes to complete an 18 inches long weld.
- Answer:
- Travel Speed = Length of Weld/Time to weld = 18 inches/2 minutes = 9 in/min.
- Voltage = 24 volts.
- Current = 120 amps.
- Heat Input = (24 X 120 X 60)/ 9 = 19200 J/in.
- Table – 1.
How do you calculate net heat input?
The formula is as follows:
- Heat Input = (60 x Amps x Volts) / (1,000 x Travel Speed in in/min) = KJ/in.
- Travel Speed = Length of Weld / Time to weld = 25 inches / 2 minutes = 12.5 inches per minute.
- Heat Input = [(60 sec/min) x (325 amps) x (29 volts)] / [(1,000 joules/kilojoule) x (12.5 inches/minute)]
What is the formula for heat input?
Heat input (Kilojoules/in.)= Amps X Volts x 0.06 divided by Travel Speed (in/minute). Some formula / by 1000, . 06×1000 =60 or 60 minutes.
How do you calculate melting efficiency?
The reported values of melting efficiency were calculated by dividing the enthalpy of the weld volume in joules by the net heat in- put in joules.
What is current in welding?
WELDING CURRENT The welding current is the electrical amperage in the power system as the weld is being made. It is usually read from the power source meter, but a separate ammeter is often used. In other words, an increase (or decrease) in the wire-feed speed will cause an increase (or decrease) of the current.
How do you calculate voltage and current in a welder?
The relationship between voltage and current (amperes) is Ohm’s law V=IR. In words voltage is equal to current multiplied by resistance. Welding machines are classified as constant voltage or constant current.
How do you calculate heat output?
Heat output is measured in British Thermal Units (BTUs) – 1kw/hr = 3412 BTU/h or 1000 BTU/h is around 293W. Based on the 754 watt figure, BTUs/hr = (754 watts * 3600) / 1054 = 2577 BTUs per hour, per server….
| Operating System | (none) |
|---|---|
| Summary | Guidelines for calculating the heat output and power consumption of RM systems. |
What is heat input rate?
The heat input rate is the maximum rate of energy flow into an appliance, calculated as the rate of fuel flow to the appliance multiplied by either the fuel’s gross or net calorific value.
How do you calculate welding speed?
measure the length of the weld… multiply the length by 10 and you have the inches per minute (60 seconds in a minute = 6 seconds x 10)…if the welder travels 1.5 inches in 6 seconds then the travel speed is 15 ipm…
What is heat transfer efficiency in welding?
The measured heat transfer efficiency for GMAW-P varied slightly over a wide range of pulse parameters, with an average value of 70%, a maximum of 72% and a minimum of 68%. Mathematical analysis shows that average instantaneous power values must be used when current and voltage vary significantly with time.
What is the heat affected zone HAZ of a weld joint?
The heat affected zone (HAZ) is that area of metal that has not been melted and has undergone changes in properties as a result of being exposed to relatively high temperatures during welding. The HAZ is located between the weld and the unaffected base metal and is illustrated graphically in Figure 1.
What is AC and DC in welding?
AC and DC welding are forms of arc welding that use different currents to produce an electric arc. ‘ The DC polarity is constant while the AC polarity flows in one direction for half of the time and half of the time in the other, reverse, direction.
How to calculate the strength of a weld?
Strength of weld in shear Strength of base metal = 0.75 x 0.707 x a x Lw x fw = 0.9 x 0.6 x Fy x t x Lw. Smaller governs the strength of the weld Always check weld metal and base metal strength. Smaller value governs. In most cases, the weld metal strength will govern.
Are there any welding calculators that are free?
These welding calculator are completely free to use and can act as a handy guide for your personal projects. You can click on any of the welding calculators below to go to that specific page and then you simply enter in the metal you will be welding, along with the electrode, and you should get the guide you are looking foor.
How to calculate the area of a fillet weld?
An asymmetrical fillet weld is a little more difficult; the area of a triangle is given by the base Z 2 times the height Z 1 divided by 2 so when a fillet weld is deposited with unequal leg lengths the area can be calculated from multiplying the throat, a, by the length of the face I and divided by 2 as illustrated in Fig.2. Fig.2.
How to calculate volume of a V butt weld?
There are three factors that determine the volume of the weld in a single V butt weld. These are the angle of the bevel, b, the excess weld metal and the root gap, g, as illustrated in Fig 3. To calculate the area of this weld we need to be able to add together the areas of the four components illustrated in Fig.3.