Aluminium Fabrication in Auckland

Otahuhu Engineering knows that aluminium Welding is a fabrication  process that joins metals  together  by  causing coalescence is a welding term,  it is  two or  more  pieces of  metal  where the  joining  points  have been liquified  by  heat  in order to bond them  together, the  liquids coalescers  where they solidify making the  pieces of  metal a  continuous solid. If welded to a  high  standard the  metal will  retain its  original strength. Different metals require  different  conditions to weld,  some require  higher temperatures and  some even require a  pressure to be exerted  along with  the heat. Aluminium welding Auckland provides, aluminium one of the materials  in which the weld ability varies  greatly, this  depends  on the alloys chemical composition. This is  a material  that is  susceptible to a  condition  called  hot cracking;  this is  possible  to overcome  though  by  lowering  the heat  input and  increasing up the welding speed. Preheating is  a method used which makes the temperature gradient  across the weld  zone  lower and contributes  greatly to  eliminating  hot cracking. Another  method to  help  stop  hot cracking is to  change the filler alloy to a  more  compatible one. Aluminium welding Auckland, before welding aluminium  the first  thing done by them is to  make sure the  surface  area is clean. All oils, oxides and any  loose  particles  on the weld  surface  must be  removed  in order to weld  successfully and properly. Aluminium is  susceptible to porosity  this is  due to oxygen, hydrogen and dross;  it is  because of this  fact that the  cleaning  should be  top  priority  when  starting a weld project.

"Fabrication,"  particularly  when  linked to industry, implies the  building of structures, machines,  products or  other  equipment  by stamping,  cutting shaping,  joining  and even assembling  components from  raw  materials -  most often metals.It is  commonly  considered  standard to  assume  that a metal fabrication operation  includes welding  also,  but  I have  chosen  to separate this out as  some welding operations  are now very  specialist  techniques.Often a small  business that specialises  in this  type of  work is  known as a fabrication  shop,  but it  should be  noted  that in  most  instances the  individual  parts and metalworking  activities will overlap with  machine  shop  work and sheet  metal engineering or sheet  metal  work.What sounds a  simple  activity  such as  cutting  metal can  mean many  different things from shearing, sawing, to  cutting torches and water jet cutters and  finally to laser  cutting tables and plasma  cutting. Depending upon  the speed and accuracy of what you want, and  cost and  quality requirements;  you will  always  need  to check  on the  capabilities and capacities of the fabrication facility  that you intend to use.In  general  terms the metal fabrication Auckland and welding  shop is  likely to  cover  many of the following  activities:Cutting, Burning, Bending, Wheeling, Shearing, Folding, Forming,Punching, Milling, Tapping, Turning, Welding, Soldering, Welding.Welding  is often a  major  part of  metal fabrication Auckland  and many  formed  parts and assemblies  will be  welded  together  prior to being checked for accuracy and fit.Welding is a fabrication  method  which is predominantly  about  joining metals or thermoplastics  by  causing coalescence  which is  commonly  achieved  by melting the  parts,  adding a filler  material to  form the weld pool which,  when cooled,  becomes  a very  sturdy joint. This is  different to brazing and soldering which does  not  induce melting of the  initial  components  but melts  a material  between the  components to  form a bond  between them.There are  lots  of different  forms of  energy which  can be used for welding  other than the  gas flame  most  of us  recognise being  also; laser,  electric arc, electron beam, friction or ultrasound. Welding is a  skilled operation and  requires  also  several  safety precautions to  avoid burns, shocks, eye damage, fumes etc.Metal fabrication Auckland shops will  offer  specialist  techniques  such as MIG and TIG Welding,  which are  briefly  outlined below:MIG WeldingMIG welding or  metal arc welding  was  originally  developed for welding aluminium and  other non-ferrous metals. It is  usually  an automatic or semi- automatic  process  whereby an electrode joins  two  pieces of  metal as  a direct  current is  continuously  passed  through a welding gun. 

This is  done  at the  same time as an inert  gas  is also  passed  through the gun which stops any air borne contaminants  entering the weld  area.MIG welding  allows the welding  process to be  much  faster than  other  methods which makes it  ideal for welding softer metals  such as aluminium fabrication auckland. It produces  continuous welds  faster than  traditional  methods, and produces  cleaner weldsAs  it is very versatile, MIG welding  can be used with a  wide  variety of metals and alloys.TIG WeldingTungsten inert  gas welding or TIG welding, for short, is an arc welding  process that  uses a tungsten electrode  to produce the weld. Similar to MIG welding in that the weld  area  is also  protected from atmospheric  contamination  via an inert  gas ( usually Helium or Argon or a  combination), and a filler  metal is  often used,  although  certain welds,  called autogenous welds, do  not require this. The constant- current produces  energy which in turn, is  conducted  across the arc  through a  combination of ionized  gas and  metal vapours  which is  known as plasma. Welding is  often used to weld non-ferrous metals  such as magnesium, copper alloys and aluminium  and thin sections of  stainless steel  and as the  technique  gives the  experienced welder  greater  control over the weld it has  some  advantages over welding in that  it can produce even  higher  quality and  stronger welds. The filler rod is  usually  made from the  same  material  as the base  metal and is used  for reinforcing joints and welding heavy metals. Several joint  types are  used in TIG welding  inclusive of butt joints which do  not  always require the filler rod assistance), lap joints,  corner joints and t-joints.It is however,  more  complex than MIG welding and  harder to  learn and is  much slower that  most of  the other  techniques. Finally  it is  worthwhile checking  to see that Otahuhu Engineering offers  other  services which  could be  helpful to you - in  today's  fast paced  environment  it is  worth seeing if  you chose . It will now  offer  other  services  such as: Design and prototyping, Powder coating, Assembly Testing and  final inspection, Packing and Distribution.

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