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不鏽鋼複合板過渡層焊接時存在的問題

發布日期:2016-01-19 瀏覽次數:文章來源:未知 作者:北京不鏽鋼

導讀:北京AG平台不鏽鋼裝飾工程有限公司是集銷售與設計、加工、製作、安裝為一體的北京不鏽鋼加工廠。本公司在 北京不鏽鋼加工 、不鏽鋼工程上始終堅持以人為本、質量興業、用戶至上的服務宗旨,以獨到的設計風格、精良的施工質量、規範的工程監控體係、 不鏽鋼


    北京AG平台不鏽鋼裝飾工程有限公司是集銷售與設計、加工、製作、安裝為一體的北京不鏽鋼加工廠。本公司在北京不鏽鋼加工、不鏽鋼工程上始終堅持以人為本、質量興業、用戶至上的服務宗旨,以獨到的設計風格、精良的施工質量、規範的工程監控體係、
     不鏽鋼複合板焊接,應將基層和複層分開焊接,基層與複層交界處應焊接過渡層。基層焊接和複層焊接屬於同種焊接,工藝比較成熟。過渡層焊接屬於異種鋼焊接,也是不鏽鋼複合板焊接的關鍵。基層與複層成分及性能差異較大,因此控製好過渡層的焊接是獲得高質量接頭的關鍵。
   不鏽鋼複合板過渡層焊接時主要存在的問題:
  (1)過渡層 當采用不鏽作填充金屬時,碳鋼母材和填充材料成分相差懸殊。由於碳鋼一側液態金屬溫度較低、流動性較差,不能充分相互混合,所以靠近熔合線碳鋼成分所占比例越大,被稀釋得就越嚴重,這部分被稀釋的焊縫金屬稱為過渡層,它在碳鋼和不鏽鋼焊縫之間會形成馬氏體。當馬氏體區較寬時,會顯著降低接頭韌性,使用過程中出現脆性破壞。因而要求衝擊韌度較高時,選用高鎳填充金屬。
  (2)焊縫金屬的稀釋 由於基層碳鋼不含合金元素Cr、Ni,所以熔化時對焊縫金屬中合金元素Cr、Ni有稀釋作用,使焊縫中奧氏體形成元素Cr、Ni含量減少,焊縫金屬中會產生馬氏體淬硬組織,易產生裂紋,從而惡化接頭質量。因此,焊接過渡層時,應使用含鉻、鎳量較多的焊接材料,使之即使受到基層的稀釋,也不會產生馬氏體淬硬組織。同時采用合適的焊接方法和焊接工藝,減小基層一側熔深和焊縫的稀釋。
  (3)焊接接頭高應力狀態 由於碳鋼與不鏽鋼線脹係數、熱導率不同,在焊接高溫下會產生熱應力。同時焊接接頭在交變溫度條件下工作時,容易形成熱疲勞裂紋。因而焊後熱處理消除焊接應力是不可能的,可選用線脹係數與碳鋼接近且塑性好的高鎳基焊條焊接,使熱應力集中在不鏽鋼一側熔合線處,通過不鏽鋼的塑性變形,減小熱應力及熱疲勞應力的不利影響。

  (4)擴散層 基層碳鋼含碳量高、合金元素含量少,而不鏽鋼相反,在熔合線兩側形成濃度差。焊接複合鋼板時,碳從碳鋼向不鏽鋼焊縫擴散,結果在熔合線碳鋼一側形成脫碳層而軟化,在不鏽鋼焊縫一層形成增碳層而硬化。擴散層隨溫度增高和高溫停留時間加長而增大。由於熔合線兩側金屬性能相差懸殊,接頭受力可能引起應力集中,降低接頭的高溫強度和塑性,因而擴散層是不鏽鋼複合板焊接的薄弱環節。文章來源:(http://www.justgoshop.net

 常見的問題:
1、不鏽鋼複合板焊接時,可不可以先焊複層,再焊接過渡層,最後采用基層焊材焊接基層?為什麽?

基層一般是不鏽鋼,複層是碳鋼,先焊了複層也就是最外層,怎麽焊裏麵呢,而且你說的還是小口徑。

2、 不鏽鋼的焊接方法有那幾種呢? 又是否一定要用不鏽鋼作為焊材呢?

不鏽鋼的焊接方法很多,主要有:

    手工電弧焊

    手工氬弧焊

    自動氬弧焊

    熔化極惰性氣體保護焊

    埋弧焊

    等離子弧焊

    激光焊等
Beijing Yi Feng Yuan Da stainless steel decoration Engineering Co., Ltd. is a set sales and design, processing, production, installation as one of Beijing's stainless steel processing factory. The company in Beijing stainless steel processing, stainless steel works always adhere to people-oriented, the quality of Societe Generale, customer supreme principle of service, with unique design style, excellent construction quality, standardize project supervision system,
Stainless steel clad plate shall be welded with the base layer and clad layer separately, and the transition layer should be welded at the junction of the base layer and the clad layer. The base layer and clad layer are the same kind of welding, and the process is more mature. The transition layer welding is a welding of dissimilar steel, which is the key of the welding of stainless steel clad plate. At the basic level, the composition and performance of the compound layer is large, so the welding of the transition layer is the key to obtain the high quality joint.
Main problems in welding of stainless steel clad plate:
(1) when the transition layer is filled with stainless steel, the carbon steel base material and the filling material composition differ greatly. Due to the low carbon steel by the side of the liquid metal temperature, poor liquidity cannot fully mixed with each other so close to the larger proportion of the fusion line carbon composition, was diluted to the more serious, this part of the diluted weld metal known as the transition layer, it between the carbon steel and stainless steel weld will martensite formation. When the martensite region is relatively wide, it will significantly reduce the joint toughness, the use of brittle failure. When the impact toughness is high, the high nickel filled metal is used.
(2) of the weld metal dilution due to non base carbon steel alloying elements Cr, Ni, so melting on the weld metal alloy elements Cr and Ni with dilution effect, make weld Austenite Formation elements (Cr, Ni content decreases, the weld metal will produce martensite hardened tissue, easy to produce crack, which deteriorates the quality of joints. Therefore, welding transition layer should be use more containing chromium and nickel welding material, even by the grassroots of dilution, also won't produce martensite hardened tissue. At the same time, the suitable welding method and welding technology is adopted to reduce the depth of the base side and the dilution of the weld.
(3) the high stress state of welded joints is due to the difference of the expansion coefficient and thermal conductivity between the carbon steel and the stainless steel, and the thermal stress will be produced at high temperature. At the same time, the thermal fatigue crack is easily formed when the welding joint is working under the condition of alternating temperature. And post weld heat treatment to eliminate welding stress force is not possible, can choose linear expansion coefficient and carbon steel and close to the plastic of high nickel base welding rod, the thermal stress concentration in the stainless steel side near the fusion line, through stainless steel plastic deformation and reduce the heat should be harmful effects of stress and thermal fatigue stress.
(4) the carbon content of the carbon content in the base of the diffusion layer is high, the content of the alloy element is little, but the stainless steel is opposite, and the concentration difference is formed on the two sides of the fusion line. Composite plate welding, carbon from carbon steel to stainless steel weld diffusion. The results in one side of the line of fusion carbon steel formation decarburized layer and softening, in stainless steel weld layer formation of carburizing and hardening. The diffusion layer increases with the increase of the temperature and the residence time of the high temperature. Due to the poor performance of the two sides of the fusion line, the stress concentration of the joint can be caused by the stress concentration, and the high temperature strength and plasticity of the joint are reduced, so the diffusion layer is the weak link of the welding of the stainless steel clad plate. Article source: (http://www.justgoshop.net)
Common problems:
1, welding of stainless steel clad plate, can't weld cladding, welding transition layer. Finally, the basic welding welding base? Why?
Basic level is generally stainless steel, clad is carbon steel, the first welding layer is the most outer layer, how to weld it, and you say or small caliber.
What kinds of welding methods, 2 stainless steel? Whether must use stainless steel as a welding material?
There are many welding methods for stainless steel:
Manual arc welding
Manual argon arc welding
Automatic argon arc welding
Inert gas shielded arc welding
submerged arc welding
Plasma arc welding
Laser welding

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