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It's when the different metals parts haven't melted together properly
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∙ 6y ago
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What is a fusion weld?
A fusion weld has no filler material. The pieces to be joined are touching and heat is applied at the joint. The edges melt and "fuse/weld" together. TIG or Oxy-fuel Welding is used. This type of welding is considered to be pure as nothing is added to the weld.
How do you check the welding penetration and welding strength?
Basic test is to cut across the weld and polish the metal. Most times the weld can be seen as a different shade. Inclusions and incomplete fusion are visible You can cut strips across the weld joint and bend them to look for fracturing. Ultimate test is to x-ray the weld. Defects and incomplete fusion can be seen. Same process as an x-ray of your body. Also a section can be cut from the joint and subjected to a tensile test where the piece is literally pulled apart. A good weldor knows when he has produced a perfect weld just by observing the weld bead as it is deposited. Using the correct electrode produces a weld slightly stronger than the base metal.
What is an example of autogenous welding?
An autogenous weld is one where filler metal is not used for joining. the weld is produced by fusion of the parts by melting. It does not use force to bond the parts, only the heat produced which cause melting of the base materials.
What is the difference between fusion welding an resistance welding?
Fusion welding is just any welding process which inhibites the phase trasition from solid to liquid and then back to solid state, while electric resistance welding is based on purely ohmic heating of the different parts, this heat will create fusion of the metal. So; Electric resistance welding can be said to be a type of fusion welding, but not the other way around.
What does the term lack of penetration mean in welding?
Incomplete penetration (IP) or lack of penetration (LOP)occurs when the weld metal fails to penetrate the joint. It is one of the most objectionable weld discontinuities. Lack of penetration allows a natural stress riser from which a crack may propagate. The appearance on a radiograph is a dark area with well-defined, straight edges that follows the land or root face down the center of the weldment.Mechanical Design EngineerMoustafa I. Eldysouky Eldarandaly
If the weld does not combine with another weld or the base metal it is referred to as?
Lack of fusion and inadequate penetration.
What is welding fault of lack of fusion?
It's when the different metals parts haven't melted together properly
What is weld defect?
Under cut: groove formed along the edges of welding bead, thereby reducing the thickness of base metalCracks: Discontinuity in the weld zonePorosity: Holes in the weld metal caused by the entrapment of gasSlag inclusion: An entrapment of slag or other foreign metal actually inside the weld metalLack of penetration: Lack of weld metal actually entering the parentLack of fusion: Lack of thorough and complete mixing between filler metal and base metal
What is a fusion weld?
A fusion weld has no filler material. The pieces to be joined are touching and heat is applied at the joint. The edges melt and "fuse/weld" together. TIG or Oxy-fuel Welding is used. This type of welding is considered to be pure as nothing is added to the weld.
Can fusion occur when atoms get weld together?
yeah
Is solid state weld the same as fusion welding?
no
What is 7 welding defects?
Under cut: groove formed along the edges of welding bead, thereby reducing the thickness of base metalCracks: Discontinuity in the weld zonePorosity: Holes in the weld metal caused by the entrapment of gasSlag inclusion: An entrapment of slag or other foreign metal actually inside the weld metalLack of penetration: Lack of weld metal actually entering the parentLack of fusion: Lack of thorough and complete mixing between filler metal and base metal
What are the causes of slag inclusion?
Slag inclusions are nonmetallic solid material entrapped in weld metal or between weld metal and base metal. Slag inclusions are regions within the weld cross section or at the weld surface where the once-molten flux used to protect the molten metal is mechanically trapped within the solidified metal. This solidified slag represents a portion of the weld's cross-section where the metal is not fused to itself. This can result in a weakened condition which could impair the serviceability of the component. Inclusions may also appear at the weld surface. Like incomplete fusion, slag inclusions can occur between the weld and base metal or between individual weld passes. In fact, slag inclusions are often associated with incomplete fusion. Daniel
Can you gas weld with propylene gas?
Yes, but it will take years for the base metal to get hot enough for any fusion welding.
How do you check the welding penetration and welding strength?
Basic test is to cut across the weld and polish the metal. Most times the weld can be seen as a different shade. Inclusions and incomplete fusion are visible You can cut strips across the weld joint and bend them to look for fracturing. Ultimate test is to x-ray the weld. Defects and incomplete fusion can be seen. Same process as an x-ray of your body. Also a section can be cut from the joint and subjected to a tensile test where the piece is literally pulled apart. A good weldor knows when he has produced a perfect weld just by observing the weld bead as it is deposited. Using the correct electrode produces a weld slightly stronger than the base metal.
What is a nonfusion welding?
it should be called solid state welding which does not melt the base... in fusion welding the base melts as you weld.
What is an example of autogenous welding?
An autogenous weld is one where filler metal is not used for joining. the weld is produced by fusion of the parts by melting. It does not use force to bond the parts, only the heat produced which cause melting of the base materials.
