Answers
Unit 23, Assignment 3 - Producing Quality Welded Joints (M2)
- Course
- Institution
BTEC Engineering Level 3
[Show more]
1 review
By: jessicarayloyal • 3 year ago
Seller
Follow
misterf
Reviews received
Content preview
Unit 23 Producing Quality Welded Joints Assignment 3For this assignment I will discuss the advantages & disadvantages of two welding processes
considering consumables, equipment, technique & quality for a given welding application.
Beginning with Gas Welding, this method mainly focuses on high temperature flames that are
produced by gas combustion, which is used to melt the work pieces together. In gas welding, there are
a few pros & cons, required to make sure that they take into account when choosing a method of
welding.
There is no requirement for refined & costly equipment as well as an additional source of electricity;
therefore, welding is very much possible in the open field. Just for added information, the majority of
the pipelines that were created between 1926 & 1935 were in fact gas welded, & this feature allows
the welder to carry out repair works in numerous parts of buildings, areas etc.
A welder can with ease vary the temperature of the flame, & when the welder changes the angle of the
flame to the surface to be welded, the temperature differs; to achieve the highest temperature, the
flame must be on a perpendicular to the object. Furthermore, the power gathered when gas welding
joins will mostly likely be larger than in arc welder using low quality electrodes.
Not only can gas welding allow for welding, cutting & tempering metals, but it can greatly vary the
power flame when welding metals with different melting points; & it can also slowly heat & cool the
welded surfaces.
Whilst there are many advantages of gas welding, there are also a lot of cons that come with it. Gas
welding has a very low welding speed, meaning that it’ll most likely lead to a wide build-up of weld;
also, the shape of the weld will not be consistent due to the fact that the weld pool has built up & then
fallen in the crater, which can further lead to weak joints & slag.
Low power density is the next con as this’ll lead to a tall, very narrow bead that has a weak
penetration to the metal. Likewise, it’ll be problematic when starting the weld & the arc is prone to
drifting towards one side of a joint in favourite to the other.
Additionally, there are heat affected zones (HAZ), which is essentially the area of base material,
(usually metal in this) that isn’t properly melted & has had its microstructure & properties changed.
Moving onto MIG welding as my second welding application; MIG welding is endured with a
handheld gun as a semiautomatic process; this process can be suited to a range of job needs by
selecting the appropriate shielding gas, electrode size & welding parameters (parameters are: voltage,
speed, arc length, rate of wire being fed). This application links the pros of stability, speed,
proportional freedom from alteration & the dependability of automatic welding with the flexibility &
control of manual welding.
The pros & cons of MIG welding are characteristically determined by the kind of MIG welder & the
nature of the job. High productivity would be the first advantage of this welding method as the many
welders will appreciate higher productivity due to time saved by not having to regularly change rods
or chip away slag as well as not having to brush the weld continually, which means that they are able
to work faster & cleaner.
One of the most beneficial advantages is of how simple MIG welding is as welders can easily learn
how to MIG weld within a very short time period. Likewise, MIG offers a better visibility of the weld
pool, making welding even more easier compared to other methods of welding.
Since MIG welding uses a shielding gas to protect the arc, there is little loss of alloying elements as
the metal transfers across the arc. There is no slag to remove, which is typical for stick welding, &
only minor weld spatter is produced.
M2 Fahim Mohammed
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller misterf. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.86. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
53068 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now