Incomplete Fusion
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Questions and Answers

What is incomplete fusion in welding?

  • Failure to maintain proper welding parameters
  • Failure to fuse between weld metal and fusion faces or adjoining weld beads (correct)
  • Failure to remove oxides and mill scale from the joint prior to welding
  • Failure to properly clean the welding electrode

What can cause incomplete fusion in welding?

  • Improper joint design and poor joint preparation (correct)
  • Using an electrode that is too small for the joint preparation
  • Improper electrode cleaning
  • Excessive welding current and voltage

How does improper electrode selection contribute to incomplete fusion?

  • Leads to rapid electrode consumption
  • Inhibits electrode manipulation (correct)
  • Causes excessive heat generation
  • Results in poor bead formation

What effect does improper welding parameter have on fusion?

<p>Parameters that are too low in current and/or voltage (B)</p> Signup and view all the answers

How does improper manipulation of the electrode contribute to incomplete fusion?

<p>Improper work or travel angles and travel speed that is too fast (B)</p> Signup and view all the answers

How does improper cleaning of material contribute to incomplete fusion?

<p>Rust, oxides and mill scale that are not removed from the joint prior to welding (C)</p> Signup and view all the answers

How does improper joint design contribute to incomplete fusion?

<p>Narrow V-groove weld in a thick plate inhibiting electrode manipulation (D)</p> Signup and view all the answers

What is an example of poor joint preparation and fit-up that can lead to incomplete fusion?

<p>Uneven root faces and uneven bevel angles (D)</p> Signup and view all the answers

What is the consequence of using an electrode that is too large for the joint preparation?

<p>Inhibits electrode manipulation (D)</p> Signup and view all the answers

What is the impact of welding parameters that are too low in current and/or voltage?

<p>Can result in incomplete fusion (A)</p> Signup and view all the answers

What is the effect of uneven root faces on the likelihood of incomplete fusion?

<p>Increases the likelihood of incomplete fusion (B)</p> Signup and view all the answers

Điều gì là đặc điểm của phương pháp hàn?

<p>Lực liên kết nguyên tử (B)</p> Signup and view all the answers

Sự phát triển của phương pháp hàn liên quan đến điều gì?

<p>Giải pháp công nghệ ứng dụng đối với tiến trình thực hiện mối hàn (C)</p> Signup and view all the answers

Điều gì có vai trò quang trọng khi tiến hành hàn?

<p>Sự bảo vệ hai bề mặt đối tiếp (D)</p> Signup and view all the answers

Điều gì là điều kiện cơ bản của quá trình hàn?

<p>Lực liên kết nguyên tử (C)</p> Signup and view all the answers

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