What is the role of welding and its contribution to incinerator performance?

As we know welding can be defined as `joining of two or more metals` and welding produces flame, fire and heat. So does an incinerator, one would say!  There is, however, more to it than meets the eye.

There are different types of welding:

•                 Shielded Metal Arc welding

•                 Gas welding

•                 MIG welding

•                 TIG welding

•                 Sub arc welding

•                 Plasma arc welding

Of the above, we at Haat employ Arc welding, MIG and TIG welding. We also use Air Plasma for cutting.

What is the significance of welding to the incinerator? And how do we select the right welding technique and consumables? What exactly does welding accomplish in the final analysis?

1.      Arc welding is used primarily where dis-similar metals are to be joined.

2.      MIG welding is invariably used in our production line. We use CO₂ gas for flame protection with either solid or flux cored wire of the specification we need depending on the base metal composition. We prefer flux cored wire for the finish, quality and strength compared to solid wire.

3.      TIG welding is employed primarily to fabricate stainless steel equipment and pipelines. `Back purging` is used where the equipment is working under critical conditions.

Prior to welding, the metal plates to be joined are chamfered to get the right profile with a bevelling machine. Root gaps are pre-determined to ensure good penetration. The chamfer and root gaps are verified before welding is allowed to be carried out.

Stainless steel components are `pickled and passivated` after welding so as to remove contaminants and assist formation of continuous chromium oxide as a passive film.

The welders are qualified up to 6G under ASME Sec. IX which gives confidence to everyone about the quality of their work.

After welding, the joints are checked for DP test by a Level II inspector/certified engineer under ASME Sec V. Pipelines are subjected to hydro test.

A well-designed and well-executed weld joint is not only easy on the eye, but if it is packed with excellent mechanical properties; it becomes the corner stone for further work on the incinerator. In our 20 years or so in this field, we have never come across a weld failure in our machines. And we are talking here about nearly 600 systems of various configurations.

We at Haat pride ourselves with the quality of welding that we do, because WELDING IS THE FOUNDATION FOR GETTING A GOOD LIFE OUT OF THE INCINERATOR.  With a consciously good effort in this field of activity, the end result will always be worth the investment a client makes, as evident from confirmation from our many customers that a Haat incinerator is forever!

Read more about Haat the Company, our technologies, infrastructure and more here – Haat the Company.