Advantage and disadvantage of arc welding?

Answer 1

Arc welding has many preferable qualities in welding such as: Faster weld speeds (obvious economics). Less distortion from thermal expansion/contraction. Addition of alloying elements in the electrode flux or coating. Higher weld qualities since scavenging agents can be added that will combine a "float out" impurities. The gas shield from the flux or additional externally added inert gas shields the molten weld pool from harmful atmospheric gases such as oxygen (oxidising) and hydrogen (embrittlement). A better selection of weldable materials (extremely difficult to "torch" weld aluminum due to oxide formation and high thermal conductivity is one example magnesium will start to burn and is hard to put out would be another example).

Answer 2

ADVANTAGES AND DISADVANTAGES OF MIG WELDING

a ADVANTAGES

1) Higher welding speeds

2) Greater deposition rates

3) Less post welding cleaning (e.g. no slag to chip off weld)

4) Better weld pool visibility

5) No stub end losses or wasted man hours caused by changing electrodes

6) Low skill factor required to operate M.I.G / M.A.G.S welding torch

7) Positional welding offers no problems when compared to other processes. (Use dip or pulsed mode of transfer)

8) The process is easily automated

9) No fluxes required in most cases

10) Ultra low hydrogen process

b DISADVANTAGES

1) Higher initial setup cost

2) Atmosphere surrounding the welding process has to be stable (hence the shielding gasses), therefore this process is limited to draught free conditions

3) Higher maintenance costs due to extra electronic components

4) The setting of plant variables requires a high skill level

5) Less efficient where high duty cycle requirements are necessary

6) Radiation effects are more severe