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Can I change manufacturer of welding electrode once the WPS and PQR is approved?
Musthafauae
Yes. Manufacturer is not an essential variable.
Wiki User
∙ 11y ago
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Why do you change polarity DCRP-DCSP in SMAW?
Using DCSP when welding thin material causes more heat to be concentrated in the electrode than in the base metal. This prevents the arc from burning thru thin materials before the electrode melts.
What is resistance of earthing electrode?
It's convenient to think of the earth electrode as being surrounded by a series of increasingly-larger 'shells' of soil, through which any earth-fault current will radiate outwards. The resistance of each 'shell' is inversely-proportional to its cross-sectional area. The shell immediately surrounding the earth electrode (1, in the following diagram) will have the smallest cross-sectional area and, therefore, the greatest resistance value; as we more further and further away from the earth electrode, each subseqent shell (2, 3, 4, etc.) increases in cross-sectional area and, therefore, reduces in resistance.The further we move away from the earth electrode, the difference between the size of each shell becomes less and less significant and, therefore, the resistance between adjacent 'shells', will become less and less until, eventually, the increase in resistance, too, will become negligible.The resistance of each of these 'shells' is, of course, cumulative. So, while the rate of change in resistance is greatest in the area immediately surrounding the earth electrode, the cumulative resistancecontinues to increase until it eventually become more-or-less constant. And it is this constant value that is taken as being the resistance of the earth electrode.In practice, we cannot use an ordinary ohmmeter to measure the resistance of the earth electrode. Instead, the basis of the test is actually as follows.A small spike is laid out in a straight line radiating away from the earth electrode. The resistance is then measured between the earth electrode and the spike, using an earth megger. The test is repeated several times, with the spike moved further and further away from the earth electrode. A graph drawn from the results shows a curve which is steepest (representing the greatest rate of change of resistance) where the test spike is closest to the earth electrode, and which eventually becomes horizontal (no further rate of change of resistance). The cumulative resistance increases, until there is no further significant increase in resistance, and this value is taken as the earth-electrode's resistance. The same results will be seen in whichever radial direction the resistance is measured, relative to the earth electrode. The area, immediately surrounding the earth electrode, in which the resistance value changes is termed its 'resistance area'.For the UK, the wiring regulations, BS 7671:2008, specifies that the value of the earth-electrode resistance must be 'low enough to ensure that the potential of any exposed metalwork, with respect to earth, during an earth fault does not exceed 50 V for normal, dry, conditions'.The 'On-Site Guide', a supplement to BS 7671:2008, further specifies (section 10.3.5) that the earth-electrode resistance should 'in any event, not exceed 200 Ω'.
What is the difference between welding rectifier and welding transformer?
A rectifier is an arrangement of diodes (devices that only allow current to flow in one direction), half-wave or full-wave, that converts AC to pulsated DC. A capacitor (condenser) is used to smooth out the pulsated DC for a more true DC supply. A transformer is usually comprised of two coils of wire around an iron core that changes the ratio of input voltage/current to output voltage/current. It does this by induction (a magnetic field crossing through a coil of wire producing electricity). The Primary coil (the input) usually is a bit thicker and has less windings than the Secondary coil (the output).
Which is hotter oxy and acetylene welding or MIG welding?
This is something of a trick question... Every metal has its own melting point that must be reached to weld the material. The difference between Oxy-ace and Mig is the Heat Effected Zone. This is the blue and purple area around your weld in which the Microstructure and properties of your base material change. Oxy-Ace will have a much wider HAZ.
Which welding process uses a constant current power source?
smaw and tig(gtaw) are using CC source. because these both types using manual wire feeding. so welder can not able to maintain constant arc length. change in arc length will change voltage. so it needs power supply which should not affected by this arc length = voltage changes. that's why CC type is used for these process. in CC type source change in voltage will not change current much.
Why is it essential to use a lower current and a shorter arc length when welding in a horizontal position?
Flat, Horiz. and Overhead welding normally take the same amount of Amperage. The electrode angle would change.
Why do you change polarity DCRP-DCSP in SMAW?
Using DCSP when welding thin material causes more heat to be concentrated in the electrode than in the base metal. This prevents the arc from burning thru thin materials before the electrode melts.
Is welding a physical change or chemical change?
Chemical change
What are the advantages of using glass electrode for determining pH of solution?
The advantage of using the glass electrode for determining the PH of a solution is because the glass electrode is very sensitive to any change.
What is the best amp to use when arc welding with a 6013 rod?
depending on the thickness of steel you have to change your amperage.... i like to work with 120 or higher with 1"1/2 angle iron The thump rule for any welding rod current selection is as follows: Current = Core wire Dia of the Electrode X 40 Example (4mm X 40 = 160 Amps ) Current shall be lowered & increased based on the welding position & Job thickness etc and also depends on the welder skill & job nature +/- 10 to 20% on the above.
Why Dc welding sets are prefered over AC welding sets?
Often because with DC, it is possible to change the direction of the weld current for the task at hand.
How did the markets for the welding industry change in the 21st century?
Sales also were improving in the non-manufacturing sector as the industry sought out non-traditional markets for welding products.
Which types electrod use carbon stell welding?
It depends on the type of steel. All steel has additives called Alloys. Stainless Steel, for example, has Chromium and Nickel added to already Alloyed Steel. High Yield Steel would have more alloys than Mild Steel. In some situations you would have to know the Alloys and amounts of each to determine what Electrode is required. Using the wrong Electrode can cause a weld to fail. FYI an Alloy is an Element added to another Element to change its characteristics.
How do change a catalytic converter?
Any muffler shop will do it cheap, there is usually some welding required.
What is a potentiometric titration?
A potentiometric titration is one in which the end-point is detected by measuring the change in potential of a suitable electrode during the titration.
How do you change spark plug gap?
Go to auto parts store and you can buy a gapping and measuring tool for a couple bucks or less. You bend the metal part over the electrode. Do not damage the electrode or the ceramic. Also, it is not recommended that you use feeler gauges. HTH
Which are examples of the way a project manager uses expert judgment to manage and direct the execution of a project?
1. Sending faulty equipment back to the manufacturer after being flagged by the floor manager. 2. Consulting the Accounting Department to determine the effect of an approved change request on the project budget.
