Welding is a crucial part of any construction project. A bad welding job means the strength of the welded materials is low, making it extremely unsafe. That's why you need to know the most common welding defects and what you can do to fix or prevent them.With this article, you can ensure the quality of your welds by learning how to avoid common welding issues.
6 Common Welding
Defects And How To Fix
B L O G | F L A W L E S S S T E E L C O M P A N Y
Welding is one of the most important
processes in metal fabrication. This is
why you must always be on the
lookout for any welding defects that
may arise. With the proper strategy,
you can prevent any problems from
occurring. But first, you must know
the causes of welding defects.
Here are the most common welding
defects, their causes, and what you
can do to fix them:
Spatter is a welding flaw that happens
when little drops of molten material
dribble on the metal. This problem is
most common in gas metal arc
welding or GMAW.
Some of the main causes of welding
spatters are high running amperage,
low voltage settings, contaminated
surface, incorrect polarity, or when
the arc is too long.
There are a few strategies that can
help you avoid spatters in the future.
These include cleaning the surface
before welding, reducing the length of
the arc, using proper polarity, and
increasing the electrode angle.
Porosity is a condition that occurs
when nitrogen, oxygen, and
hydrogen are absorbed in the molten
welding material. This will cause
solidification inside the welded metal
and cause problems in the process.
Porosity is caused by inadequate
electrode de oxidant, using a longer
arc, too much moisture, incorrect
surface treatment, surface
contamination, and the presence of
rust, grease, or paint.
To avoid porosity you must clean the
welding materials before usage,
always use dry electrodes, use the
correct arc length, and make sure that
the gas flow meter is optimized with
proper pressure and flow. Using the
right electrodes and proper welding
technique will also help prevent this
Undercut is one of the welding defects
that occur when the voltage of the arc
is too high.
It can also occur when the speed of the
weld is too fast or if you use the wrong
angle, leading to more heat on the
edges. Incorrect usage of gas shielding
and poor welding techniques can