Why Welding Stainless Steel Is Difficult? | D&H Secheron

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Description

• From many welding materials in the industry.
  Welding Hard Steel was easy if practiced well
  enough, but the final welded product of steel
  came with its own set of challenges, corrosion
  being the primary reason.
• With developments in the metallurgical industry,
  low alloy steel was brought into the picture.
• Stainless Steel (SS) an alloy discovered in the
  1800s was a revolutionary alloy with many uses,
  primarily used in industrial equipment when
  long-lasting durability of the equipment was a
  priority that could be easily cleaned and the
  performance has been improved in many new ways.
• Stainless Steel is far more corrosion-resistant
  than standard carbon steel, popularly known for
  its enhanced durability, corrosion resistance
  high-temperature oxidation resistance.

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• Coming along in various material types, the
  special properties of stainless steel were
  brought out by the simple addition of alloying
  elements like nickel and chromium to steel.
• The formula is that more than 10 chromium is
  required to produce a stainless iron. Stainless
  steel has 4 grades which are further classified
  depending on the welding requirements, welding
  characteristics, microstructure (the key
  influencing factor in how strong the steel is
  going to be) and material strength.
• Austenitic Stainless Steel Single-phase, which
  is very commonly used to create stainless steel
  welding rods.
• Ferritic Stainless Steel Single phase, commonly
  used as they are cheap to manufacture.
• Martensitic Stainless Steel Used for high wear
  and tear hard facing applications.
• Austenitic-ferritic (duplex) Stainless Steel
  Double-phase that contains both ferrite and
  austenite in the microstructure.

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With such effective properties, why is it so hard
to weld Stainless Steel?

• What makes welding a bit more challenging and
  tedious especially for an expert welder,
  Stainless steel warp under high temperatures and
  distort the whole cooling process due to poor
  thermal conductivity.
• The welding result does not look flawless as it
  displays every blemish and scratch mark thats
  left behind. Correcting welding mistakes is also
  quite a bit of a challenge so precautions need to
  taken or else it would scratch very easily.

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Approaches we can use in welding stainless steel.

• The not-so-simple answer is, it depends on what
  result youre trying to achieve.
• Stainless steel can be welded with shielded metal
  arc welding (MIG), gas tungsten arc welding (TIG)
  and stick welding, and each of these processes
  will yield a slightly different result.
• To find the best welding process for your
  project, consider the following factors the
  welders skill level, the aesthetics of the final
  piece including bead appearance, the thickness of
  the metal plus the costs and timing factors of
  the project. If artistry is paramount, then the
  finesse of TIG welding could be a good fit, but
  if speed and efficiency are a priority, then MIG
  welding may be a better process.
• To simply answer your query, if you're looking
  for a more affordable weld, spot welding might be
  the best option for the job. But if the material
  were working with is thin, then TIG or gas
  tungsten arc welding might be the better choice.

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