What is the purpose of whipping in welding?
Essentially, the whip portion of the technique means moving the electrode ahead about 2 electrode diameters…. and then moving the electrode back about 1 diameter. So it’s a 2 steps forward, one step back type technique that makes for a distinct ripple pattern.
Why is it important to have a good cover pass?
Deep penetration will slow the rate of build up in the joint. Why is it important to have a good cover pass? Keeping the cover pass uniform and neat looking is important. Most welds are not tested and often the inspection program is only visual.
Why uniformity of beads is important in welding?
The target size of the weld bead is determined according to the workpiece thickness, weld length, weld joint type etc. In addition, the uniformity of the bead size is also important from the standpoint of appearance as well as strength.
What is the purpose of the filler passes?
Fill – Also referred to as a fill pass, it is the amount of weld bead necessary to fill the weld joint. This pass comes after the root pass and before the cap pass (see next). In some applications, multiple fill passes are necessary. Cap – The final weld bead in a weld joint.
Why is the curl in the wire end straightened out?
Why is the curl in the wire end straightened? … crushed the wire causing some flux to be drooped inside the wire liner, if it jammed it causes birds nest.
What does MIG stand for?
MIG stands for Metal Inert Gas. Only inert gases or gas mixtures are used for the shielding gas when MIG welding. Typical inert gases used for MIG welding are argon and helium. These gases are usually used for MIG welding of aluminium and other non-ferrous metals. MAG stands for Metal Active Gas.
Why is it important to have overlapping Stringer beads in fillet welds?
Overlapping beads are used to build up a surface and to make multi-pass welds.
What are the 5 weaving motion in welding?
This weaving motion or process should be repeated on welding beads from left to right, right to left, and top to bottom, and bottom to top—to build up an uniform appearance of the weld metal. In all cases the motion must be uniform, otherwise it would give poor fusion at the edges of the deposited metal.
What is Arc Strike in welding?
This is a defect caused by instantaneously striking an arc on the base material. In other words, an arc strike is a spot of failed arc ignition which was not fused by subsequent welding and remained on the base material. Arc strike may be the cause of cracking in the base material.
What are the characteristics of good weld beads?
The basic conditions of welding quality to achieve products of such high quality includes the following:
- No cracks or holes found in the bead.
- The bead has uniform waves, width and height.
- The finished product satisfies the design dimensions and has almost no distortion.
- The welding meets the required strength.
What are the 3 types of welding?
Three of the most common are Arc, MIG (Metal, Inert Gas) or GMAW (Gas, Metal Arc Welding), and TIG (Tungsten Inert Gas) welding. In order to know which process is best for the particular job you’re working on, here’s what you should know about each of them. Arc welding is the oldest of these three welding processes.
How can you prevent porosity?
7 Ways to Eliminate Porosity in Your Welds
- Check your gas flow rate. …
- Make sure you gas flow rate is not see too high. …
- Check for gas leaks. …
- Keep an adequate contact-tip-to-work distance (CTTWD). …
- Avoid drafty conditions. …
- Clean the surface to be welded. …
- Watch your travel angle.